Statistics as of 8:35 PM 26-Jan-2012
Langley Fork Park
Highest recorded temperature: 105.5 °F on 3:05 PM 22-Jul-2011
Lowest recorded temperature: 2.1 °F on 7:00 AM 17-Jan-2009
Total recorded temperature range: 103.4 °F
Highest recorded pressure: 30.74 in Hg on 10:00 AM 23-Dec-2008
Lowest recorded pressure: 29.15 in Hg on 4:10 AM 28-Aug-2011
Total recorded pressure range: 1.59 in Hg
Highest recorded wind speed: 33.0 Knots on 4:00 AM 03-Dec-2009
Temperature (°F)
Maximum: 28 days: 60.5 7 days: 56.6 24hrs: 53.6 Today: 53.6
Minimum: 28 days: 13.1 7 days: 25.7 24hrs: 39.2 Today: 39.3
Average: 28 days: 34.1 7 days: 36.4 24hrs: 44.8 Today: 45.7
Dew Point (°F)
Maximum: 28 days: 51.5 7 days: 47.7 24hrs: 47.7 Today: 47.7
Minimum: 28 days: -1.8 7 days: 8.0 24hrs: 32.9 Today: 33.1
Average: 28 days: 25.6 7 days: 30.5 24hrs: 39.6 Today: 40.8
Wind Speed - 10 Minute Gust (Knots)
Maximum: 28 days: 18.2 7 days: 13.9 24hrs: 7.0 Today: 7.0
Minimum: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Average: 28 days: 3.3 7 days: 1.7 24hrs: 1.2 Today: 1.4
Wind Speed - 10 Minute Average (Knots)
Maximum: 28 days: 7.8 7 days: 5.2 24hrs: 1.7 Today: 1.7
Minimum: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Average: 28 days: 0.7 7 days: 0.4 24hrs: 0.3 Today: 0.3
Wind Run (NM's)
Total: 28 days: 638.3 7 days: 85.0 24hrs: 9.6 Today: 9.5
Wind Chill (°F)
Maximum: 28 days: 60.5 7 days: 56.6 24hrs: 53.6 Today: 53.6
Minimum: 28 days: 13.1 7 days: 25.7 24hrs: 39.2 Today: 39.3
Average: 28 days: 34.0 7 days: 36.3 24hrs: 44.8 Today: 45.7
Heat Index (°F)
Maximum: 28 days: 60.5 7 days: 56.6 24hrs: 53.6 Today: 53.6
Minimum: 28 days: 13.1 7 days: 25.7 24hrs: 39.2 Today: 39.3
Average: 28 days: 34.1 7 days: 36.4 24hrs: 44.8 Today: 45.7
Wind Direction (Compass)
Average: 28 days: S by E 7 days: S by E 24hrs: SE by E Today: SE by E
Pressure (in Hg)
Maximum: 28 days: 30.61 7 days: 30.49 24hrs: 30.27 Today: 30.22
Minimum: 28 days: 29.33 7 days: 29.85 24hrs: 29.85 Today: 29.85
Average: 28 days: 30.09 7 days: 30.18 24hrs: 30.08 Today: 30.05
Precipitation (in)
Max(/h): 28 days: 1.72 7 days: 0.06 24hrs: 0.00 Today: 0.00
Totals: 28 days: 2.23 7 days: 0.24 24hrs: 0.01 Today: 0.01
Solar Radiation (W/m^2)
Max: 28 days: 687 7 days: 601 24hrs: 578 Today: 578
Average: 28 days: 72.76 7 days: 51.44 24hrs: 38.50 Today: 45.84
Temperature (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 58.60 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 58.6004
2011 58.70 75.60 79.59 89.40 99.10 100.80 105.50 100.09 89.80 82.20 71.10 63.19 84.5899
2010 65.40 50.30 77.10 92.90 96.10 99.50 103.40 98.30 98.10 87.10 68.90 63.10 83.3501
2009 54.20 70.90 77.50 95.20 87.10 92.60 95.30 96.90 87.50 76.00 74.30 62.80 80.8583
2008 N/A N/A N/A N/A N/A N/A 93.70 96.20 93.50 84.20 49.00 68.50 80.8502
Temperature (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 13.10 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.1000
2011 9.00 13.20 24.60 30.80 39.70 50.30 58.60 53.60 43.00 41.79 31.10 21.20 34.7417
2010 12.20 11.60 27.70 33.50 36.00 53.10 52.40 58.10 47.30 32.60 24.20 16.80 33.7916
2009 2.10 12.20 11.90 30.20 37.30 46.50 56.10 57.30 48.00 34.00 27.80 17.90 31.7751
2008 N/A N/A N/A N/A N/A N/A 59.20 55.70 47.20 29.60 29.90 11.40 38.8334
Temperature (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 33.09 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 33.0924
2011 30.56 39.06 45.05 58.60 67.99 75.84 81.14 75.71 68.18 55.68 50.49 42.14 57.5375
2010 32.18 31.76 49.12 59.36 67.08 77.27 80.01 77.03 71.06 57.65 46.16 30.92 56.6327
2009 29.44 38.65 44.17 55.74 65.05 71.85 74.26 76.44 66.25 49.78 49.03 35.06 54.6423
2008 N/A N/A N/A N/A N/A N/A 76.75 73.40 68.81 54.22 44.48 38.83 59.4153
Windchill (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 58.30 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 58.2998
2011 58.70 75.60 79.59 89.40 95.08 96.96 100.81 97.86 89.80 82.20 71.10 62.71 83.3170
2010 62.90 50.30 77.10 92.80 93.80 97.18 98.83 94.78 95.38 87.10 68.90 63.10 81.8479
2009 54.20 69.70 77.50 94.22 87.10 91.96 94.33 93.99 87.50 76.00 74.30 62.80 80.2998
2008 N/A N/A N/A N/A N/A N/A 93.13 95.00 92.98 84.20 49.00 67.60 80.3177
Windchill (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 13.10 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.1000
2011 9.00 13.20 24.60 30.80 39.70 50.30 58.60 50.00 43.00 41.79 31.10 21.20 34.4417
2010 7.98 11.60 27.70 33.50 36.00 53.10 52.40 58.10 47.30 32.60 24.20 16.80 33.4398
2009 2.10 12.20 11.90 30.20 37.30 46.50 56.10 57.30 48.00 34.00 27.80 17.90 31.7751
2008 N/A N/A N/A N/A N/A N/A 50.00 50.00 47.20 29.60 29.90 9.10 35.9669
Windchill (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 32.99 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 32.9861
2011 30.54 38.87 45.03 58.48 67.93 75.73 80.84 75.59 68.18 55.67 50.49 42.12 57.4552
2010 32.09 31.54 49.03 59.35 67.07 77.22 79.70 76.93 71.03 57.65 46.13 30.86 56.5492
2009 29.42 38.39 44.14 55.62 65.05 71.85 74.26 76.41 66.25 49.77 49.03 35.01 54.5995
2008 N/A N/A N/A N/A N/A N/A 76.39 73.39 68.81 54.22 43.73 38.58 59.1866
Heat Index(°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 58.60 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 58.6004
2011 58.70 77.17 80.15 92.59 115.40 117.73 133.41 110.06 100.49 84.39 76.12 63.19 92.4510
2010 65.40 50.30 77.00 92.86 108.11 114.20 122.39 115.55 107.21 88.96 76.08 63.10 90.0967
2009 54.20 75.99 78.27 95.74 92.90 102.38 102.57 109.36 94.37 78.58 76.52 62.80 85.3067
2008 N/A N/A N/A N/A N/A N/A 100.23 101.55 104.60 83.84 49.00 76.04 85.8764
Heat Index(°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 33.09 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 33.0924
2011 30.56 39.14 45.14 59.47 70.36 79.58 87.40 79.38 70.75 56.14 50.55 42.14 59.2168
2010 32.18 31.76 49.30 59.84 68.83 81.51 85.57 81.75 73.34 58.41 46.17 30.92 58.2995
2009 29.44 38.72 44.38 56.00 66.41 74.35 77.11 80.97 67.78 50.00 49.12 35.06 55.7776
2008 N/A N/A N/A N/A N/A N/A 80.31 75.62 70.91 54.67 44.48 38.84 60.8035
Wind Speed (Knots) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 18.25 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 18.2484
2011 17.38 28.68 21.72 26.07 16.51 13.03 12.17 19.98 13.03 18.25 16.51 21.72 18.7550
2010 26.07 22.59 27.81 25.20 17.38 14.77 15.64 13.90 18.25 15.64 20.86 22.59 20.0589
2009 19.12 28.68 19.99 23.46 17.38 19.99 13.90 9.56 18.25 19.12 18.25 33.02 20.0589
2008 N/A N/A N/A N/A N/A N/A 13.03 13.03 18.25 20.86 12.17 29.55 17.8140
Wind Speed (Knots) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 0.73 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.7305
2011 0.61 1.24 1.10 1.39 0.38 0.16 0.10 0.30 0.11 0.19 0.15 0.63 0.5302
2010 0.99 1.11 1.07 0.72 0.51 0.22 0.08 0.14 0.29 0.39 0.54 1.06 0.5950
2009 0.74 1.48 0.96 1.21 0.63 0.28 0.25 0.01 0.23 0.22 0.56 0.70 0.6068
2008 N/A N/A N/A N/A N/A N/A 0.19 0.29 0.35 0.41 1.85 1.17 0.7121
Wind Run(NM's)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 600.7 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 600.73
2011 603.0 1107.5 1081.3 1329.2 373.1 151.5 101.5 296.4 102.3 182.4 138.9 623.2 6090.24
2010 974.7 990.8 1051.8 689.3 505.2 214.0 82.9 141.5 273.9 380.9 516.7 1048.4 6870.10
2009 729.6 1319.9 944.8 1150.8 620.8 270.4 244.0 12.7 222.1 219.8 535.1 688.2 6958.12
2008 N/A N/A N/A N/A N/A N/A 51.8 285.4 334.9 408.5 1762.9 1157.7 4001.18
Pressure (in Hg) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 30.61 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 30.6089
2011 30.51 30.46 30.70 30.45 30.33 30.22 30.23 30.26 30.44 30.57 30.31 30.71 30.4317
2010 30.46 30.46 30.41 30.62 30.44 30.17 30.30 30.29 30.27 30.27 30.56 30.40 30.3867
2009 30.70 30.52 30.57 30.48 30.50 30.20 30.33 30.25 30.35 30.37 30.43 30.63 30.4447
2008 N/A N/A N/A N/A N/A N/A 30.16 30.35 30.47 30.66 30.36 30.74 30.4546
Pressure (in Hg) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.33 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.3329
2011 29.41 29.34 29.47 29.23 29.51 29.71 29.73 29.15 29.69 29.48 29.68 29.43 29.4854
2010 29.22 29.36 29.33 29.22 29.52 29.51 29.79 29.69 29.52 29.56 29.49 29.25 29.4565
2009 29.21 29.45 29.28 29.17 29.68 29.52 29.65 29.70 29.46 29.60 29.64 29.25 29.4685
2008 N/A N/A N/A N/A N/A N/A 29.66 29.69 29.51 29.66 29.32 29.36 29.5351
Pressure (in Hg) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 30.10 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 30.1038
2011 30.03 30.05 30.14 29.95 29.97 29.95 29.95 29.90 30.04 30.00 30.10 30.20 30.0238
2010 30.04 29.89 29.89 29.96 30.02 29.93 29.97 29.99 29.98 29.95 30.12 29.98 29.9771
2009 30.08 30.11 30.18 29.98 30.05 29.86 29.95 30.02 30.09 30.01 30.11 30.11 30.0465
2008 N/A N/A N/A N/A N/A N/A 29.90 29.97 30.10 30.17 30.14 30.15 30.0733
Precipitation (in) (Total)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 2.23 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.23
2011 1.51 1.95 0.68 0.67 0.15 0.13 0.82 0.43 8.58 2.42 0.56 4.18 22.08
2010 1.34 2.25 2.87 1.16 3.73 1.19 1.22 0.12 0.51 0.07 1.71 1.64 17.81
2009 2.43 0.21 1.60 3.28 5.78 7.21 2.36 2.84 2.37 3.37 2.79 6.04 40.28
2008 N/A N/A N/A N/A N/A N/A 1.77 1.43 9.58 1.60 0.67 2.49 17.54
Solar Radiation(W/m^2) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 687 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 687.0000
2011 N/A 886 1053 1222 1380 1276 1246 1243 1118 1016 645 649 1066.7273
2010 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2009 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2008 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
Solar Radiation(W/m^2) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 74.18 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 74.1849
2011 0.00 107.30 144.56 162.17 179.75 229.06 241.30 182.75 106.30 96.35 194.75 66.17 142.5373
2010 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0000
2009 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0000
2008 N/A N/A N/A N/A N/A N/A 0.00 0.00 0.00 0.00 0.00 0.00 0.0000
Sunshine hours (Total)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 49.11 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 49.11
2011 0.00 90.69 118.51 115.89 122.96 160.02 172.08 134.36 81.32 57.53 296.77 59.05 1409.19
2010 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2009 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2008 N/A N/A N/A N/A N/A N/A 0.00 0.00 0.00 0.00 0.00 0.00 0.00
_________________________________________
Washington/Natl, Washington D.C. (KDCA)
Highest recorded temperature: 102.9 °F on 6:12 PM 29-Jul-2011
Lowest recorded temperature: 8.1 °F on 6:00 AM 17-Jan-2009
Total recorded temperature range: 94.9 °F
Highest recorded pressure: 30.74 in Hg on 10:00 AM 23-Dec-2008
Lowest recorded pressure: -0.00 in Hg on 1:13 AM 01-Jun-2011
Total recorded pressure range: 30.74 in Hg
Highest recorded wind speed: 0.0 Knots on 9:10 AM 04-Jan-2012
Temperature (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Dew Point (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Wind Speed (Knots)
Maximum: 28 days: 0.0 7 days: -5399.6 24hrs: -5399.6 Today: -5399.6
Minimum: 28 days: 0.0 7 days: 5399.6 24hrs: 5399.6 Today: 5399.6
Average: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Wind Run (NM's)
Total: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Wind Chill (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Heat Index (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Wind Direction (Compass)
Average: 28 days: South 7 days: North 24hrs: North Today: North
Pressure (in Hg)
Maximum: 28 days: 29.53 7 days: -295.30 24hrs: -295.30 Today: -295.30
Minimum: 28 days: 29.53 7 days: 295.30 24hrs: 295.30 Today: 295.30
Average: 28 days: 29.53 7 days: 0.00 24hrs: 0.00 Today: 0.00
Precipitation (in)
Max(/h): 28 days: 0.00 7 days: -393.70 24hrs: -393.70 Today: -393.70
Totals: 28 days: 0.00 7 days: 0.00 24hrs: 0.00 Today: 0.00
Temperature (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 75.92 78.98 84.92 96.98 100.94 102.92 98.06 87.08 82.94 71.06 60.80 82.5500
2010 66.92 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 51.4100
2009 51.08 71.06 73.94 91.94 84.02 87.98 95.00 96.08 87.08 73.94 73.94 64.04 79.1750
2008 N/A N/A N/A N/A N/A N/A N/A 94.00 95.00 80.96 73.94 69.98 82.7758
Temperature (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 49.94 19.94 26.96 37.04 46.04 32.00 68.00 62.96 50.00 44.96 39.92 30.02 42.3150
2010 15.98 21.02 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 44.7500
2009 8.06 15.08 14.00 37.04 44.96 55.94 62.06 64.04 53.96 39.02 35.60 24.08 37.8200
2008 N/A N/A N/A N/A N/A N/A N/A 65.00 57.02 37.04 26.96 17.06 40.6159
Temperature (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 41.67 45.38 58.15 67.62 78.07 84.14 79.23 70.13 61.10 57.47 48.13 61.7580
2010 34.72 35.42 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 47.5112
2009 31.28 39.48 44.79 56.61 64.85 73.03 76.41 78.48 69.48 54.16 51.82 37.98 56.5310
2008 N/A N/A N/A N/A N/A N/A N/A 77.69 73.73 58.27 46.24 40.26 59.2394
Windchill (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 71.15 75.25 82.02 96.98 100.94 102.92 98.06 86.23 82.94 69.08 60.08 81.3050
2010 59.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.7500
2009 46.94 63.53 71.66 91.65 81.29 87.57 95.00 96.08 86.56 73.94 73.94 58.28 77.2028
2008 N/A N/A N/A N/A N/A N/A N/A 94.00 95.00 80.96 67.40 66.20 80.7120
Windchill (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 32.00 0.39 3.11 21.72 28.96 50.00 64.69 59.53 40.69 33.01 25.47 16.34 31.3254
2010 -16.60 8.66 32.00 32.00 32.00 32.00 32.00 32.00 50.00 32.00 32.00 32.00 27.5052
2009 -23.45 -14.52 -15.10 19.86 38.87 50.00 50.00 55.61 47.62 19.88 17.86 -2.63 20.3336
2008 N/A N/A N/A N/A N/A N/A N/A 59.38 32.00 24.81 3.47 -12.87 21.3573
Windchill (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 43.13 33.92 36.58 51.82 64.27 76.36 83.29 77.47 67.73 58.84 56.27 46.21 57.9903
2010 23.18 25.73 35.62 46.09 41.41 39.88 34.13 40.20 50.00 35.51 32.02 35.90 36.6378
2009 22.12 28.29 36.66 50.71 61.18 70.40 74.55 77.36 66.35 48.50 45.77 29.34 50.9350
2008 N/A N/A N/A N/A N/A N/A N/A 76.10 71.27 53.31 39.40 31.37 54.2904
Heat Index(°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 76.60 78.58 84.03 103.63 107.12 121.76 104.45 94.01 82.01 76.13 60.80 86.5931
2010 66.92 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 51.4100
2009 51.08 75.68 76.52 90.50 85.47 93.78 95.97 101.25 90.71 76.30 76.06 64.04 81.4462
2008 N/A N/A N/A N/A N/A N/A N/A 97.53 101.67 82.69 77.09 76.13 87.0224
Heat Index(°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 49.97 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 49.9726
2011 50.00 41.74 45.44 58.89 69.48 81.02 88.68 82.33 73.06 61.64 57.53 48.14 63.1610
2010 34.72 35.42 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 47.5112
2009 31.28 39.53 44.90 56.91 66.50 75.85 79.24 81.91 71.73 54.38 51.94 37.98 57.6790
2008 N/A N/A N/A N/A N/A N/A N/A 80.28 76.52 59.11 46.29 40.28 60.4961
Wind Speed (Knots) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2011 5.00 29.00 25.00 38.00 22.00 19.00 20.00 36.00 22.00 20.00 18.00 27.00 23.4482
2010 27.00 11.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 7.6660
2009 26.00 26.00 27.00 24.00 26.00 31.00 20.00 22.00 22.00 18.00 22.00 23.00 23.9146
2008 N/A N/A N/A N/A N/A N/A N/A 22.00 27.00 23.00 24.00 28.00 24.7432
Wind Speed (Knots) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2011 5.40 8.02 8.35 8.90 6.76 6.54 6.19 7.25 5.42 4.75 2.24 2.06 5.9896
2010 8.72 7.79 5.40 4.23 2.82 2.36 0.64 2.46 5.40 1.05 0.01 4.83 3.8090
2009 6.95 9.52 7.79 7.76 6.47 6.87 6.56 5.26 6.65 6.94 6.95 7.39 7.0914
2008 N/A N/A N/A N/A N/A N/A N/A 6.23 6.64 6.83 7.01 8.03 6.9482
Wind Run(NM's)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 0.0 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.00
2011 5320.0 7139.7 8035.9 8489.5 6660.8 6232.1 6094.8 7144.8 5167.0 4677.3 2140.4 1934.8 69037.18
2010 8587.3 6932.9 4805.2 4018.6 2781.6 2252.4 507.7 2309.6 5148.4 1036.8 7.2 4762.3 43150.14
2009 6843.9 8470.4 7651.8 7399.7 6371.3 6551.0 6459.3 5178.9 6342.8 6838.8 6634.1 7285.6 82027.59
2008 N/A N/A N/A N/A N/A N/A N/A 6142.0 6328.2 6732.1 6694.8 7907.7 33804.83
Pressure (in Hg) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 30.45 30.69 30.44 30.32 30.21 30.21 30.24 30.41 30.55 30.25 30.71 30.3345
2010 30.46 30.38 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.6784
2009 30.69 30.52 30.57 30.49 30.50 30.21 30.33 30.25 30.35 30.36 30.44 30.64 30.4459
2008 N/A N/A N/A N/A N/A N/A N/A 30.34 30.46 30.65 30.54 30.74 30.5461
Pressure (in Hg) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 29.36 29.47 29.27 29.50 -0.00 29.71 29.12 29.74 29.47 29.69 29.52 27.0318
2010 29.24 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.5058
2009 29.20 29.45 29.28 29.17 29.69 29.52 29.63 29.71 29.45 29.61 29.65 29.27 29.4693
2008 N/A N/A N/A N/A N/A N/A N/A 29.69 29.47 29.66 29.32 29.33 29.4941
Pressure (in Hg) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 30.04 30.14 29.94 29.95 29.91 29.94 29.89 30.02 29.98 30.09 29.82 29.9373
2010 30.05 30.11 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.6219
2009 30.08 30.12 30.18 29.99 30.05 29.86 29.95 30.02 30.09 30.06 30.11 30.11 30.0512
2008 N/A N/A N/A N/A N/A N/A N/A 29.97 30.10 30.17 30.08 30.15 30.0935
Precipitation (in) (Total)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.00
2011 0.00 0.06 0.24 0.20 0.08 0.07 0.15 0.47 0.87 0.51 0.02 0.15 2.81
2010 0.88 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.88
2009 1.74 0.10 0.92 2.59 9.19 5.26 1.95 2.14 2.10 12.23 1.90 5.58 45.70
2008 N/A N/A N/A N/A N/A N/A N/A 1.57 9.36 1.05 1.87 2.15 16.00
_________________________________________
Wash Dc/Dulles, Virginia (KIAD)
Highest recorded temperature: 105.1 °F on 5:14 PM 22-Jul-2011
Lowest recorded temperature: 1.0 °F on 7:00 AM 17-Jan-2009
Total recorded temperature range: 104.0 °F
Highest recorded pressure: 30.71 in Hg on 10:00 AM 23-Dec-2008
Lowest recorded pressure: -0.00 in Hg on 1:13 AM 01-Jun-2011
Total recorded pressure range: 30.71 in Hg
Highest recorded wind speed: 0.0 Knots on 9:10 AM 04-Jan-2012
Temperature (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Dew Point (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Wind Speed (Knots)
Maximum: 28 days: 0.0 7 days: -5399.6 24hrs: -5399.6 Today: -5399.6
Minimum: 28 days: 0.0 7 days: 5399.6 24hrs: 5399.6 Today: 5399.6
Average: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Wind Run (NM's)
Total: 28 days: 0.0 7 days: 0.0 24hrs: 0.0 Today: 0.0
Wind Chill (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Heat Index (°F)
Maximum: 28 days: 50.0 7 days: -17968.0 24hrs: -17968.0 Today: -17968.0
Minimum: 28 days: 50.0 7 days: 18032.0 24hrs: 18032.0 Today: 18032.0
Average: 28 days: 50.0 7 days: 32.0 24hrs: 32.0 Today: 32.0
Wind Direction (Compass)
Average: 28 days: South 7 days: North 24hrs: North Today: North
Pressure (in Hg)
Maximum: 28 days: 29.53 7 days: -295.30 24hrs: -295.30 Today: -295.30
Minimum: 28 days: 29.53 7 days: 295.30 24hrs: 295.30 Today: 295.30
Average: 28 days: 29.53 7 days: 0.00 24hrs: 0.00 Today: 0.00
Precipitation (in)
Max(/h): 28 days: 0.00 7 days: -393.70 24hrs: -393.70 Today: -393.70
Totals: 28 days: 0.00 7 days: 0.00 24hrs: 0.00 Today: 0.00
Temperature (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 73.94 78.98 86.00 93.92 96.08 105.08 96.08 87.98 80.06 69.98 62.60 81.7250
2010 64.94 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 51.2450
2009 57.02 69.98 75.92 91.94 86.00 89.96 93.92 100.94 87.08 77.00 75.02 60.98 80.4800
2008 N/A N/A N/A N/A N/A N/A N/A 93.00 91.94 82.94 73.04 68.00 81.7840
Temperature (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 49.92 12.02 24.98 30.92 41.00 32.00 57.92 53.96 42.98 44.06 37.04 21.92 37.3934
2010 15.08 8.06 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 43.5950
2009 1.04 10.94 10.94 32.00 37.94 48.92 55.94 60.98 48.92 35.06 28.94 14.00 32.1350
2008 N/A N/A N/A N/A N/A N/A N/A 50.00 46.94 28.94 19.94 12.92 31.7480
Temperature (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 38.75 44.42 57.53 66.27 74.71 80.98 76.23 68.37 57.81 59.15 47.13 60.1127
2010 32.88 35.24 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 47.3435
2009 29.67 38.10 43.90 56.12 64.60 73.07 75.29 77.43 68.25 52.07 50.10 35.78 55.3647
2008 N/A N/A N/A N/A N/A N/A N/A 74.19 69.55 55.02 44.47 38.54 56.3517
Windchill (°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 70.09 76.98 84.11 93.92 96.08 105.08 96.08 87.42 79.81 68.00 60.98 80.7125
2010 58.50 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.7081
2009 52.31 61.32 74.76 91.94 84.77 89.96 93.92 100.94 86.39 77.00 75.02 57.72 78.8366
2008 N/A N/A N/A N/A N/A N/A N/A 93.00 91.94 82.94 71.06 63.40 80.4690
Windchill (°F) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 32.00 -2.02 3.13 20.75 28.17 49.08 50.00 50.00 41.11 29.46 26.67 14.76 28.5917
2010 -23.78 3.86 32.00 32.00 32.00 32.00 32.00 32.00 50.00 32.00 32.00 32.00 26.5066
2009 -20.06 -13.27 -16.72 19.17 37.94 48.92 55.94 50.00 44.60 21.95 16.74 -4.73 20.0397
2008 N/A N/A N/A N/A N/A N/A N/A 32.00 32.00 22.33 3.11 -11.99 15.4886
Windchill (°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 43.13 31.70 37.31 51.75 63.64 73.32 80.34 74.80 66.55 55.89 58.26 45.49 56.8492
2010 21.89 28.44 35.62 46.09 41.41 39.88 34.13 40.20 50.00 35.51 32.02 35.90 36.7569
2009 22.43 28.09 37.72 51.10 61.36 71.39 74.21 76.62 66.06 46.80 45.34 28.62 50.8102
2008 N/A N/A N/A N/A N/A N/A N/A 72.82 67.68 51.07 39.42 30.83 52.3639
Heat Index(°F) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 50.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 50.0000
2011 50.00 75.73 78.46 85.54 100.91 103.14 117.75 99.89 95.12 80.18 76.00 62.60 85.4414
2010 64.94 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 51.2450
2009 57.02 75.50 77.03 89.04 87.37 94.01 94.95 108.71 89.79 77.03 75.89 60.98 82.2750
2008 N/A N/A N/A N/A N/A N/A N/A 95.32 99.67 82.69 76.35 76.13 86.0313
Heat Index(°F) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 49.97 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 49.9726
2011 50.00 38.79 44.49 58.26 67.89 77.37 84.64 79.07 71.00 58.20 59.22 47.13 61.3386
2010 32.88 35.24 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 50.00 47.3435
2009 29.67 38.13 44.08 56.30 66.12 75.41 77.74 80.91 70.11 52.34 50.24 35.78 56.4019
2008 N/A N/A N/A N/A N/A N/A N/A 76.26 71.80 55.45 44.56 38.55 57.3241
Wind Speed (Knots) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2011 5.00 37.00 25.00 26.00 28.00 22.00 26.00 28.00 25.00 18.00 17.00 24.00 23.4481
2010 29.00 7.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 7.4994
2009 22.00 26.00 27.00 27.00 19.00 25.00 21.00 19.00 21.00 20.00 26.00 27.00 23.3314
2008 N/A N/A N/A N/A N/A N/A N/A 18.00 25.00 22.00 21.00 28.00 22.8481
Wind Speed (Knots) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0000
2011 5.40 7.22 7.28 8.34 5.73 5.09 4.59 5.76 4.32 2.92 1.09 1.77 4.9587
2010 8.16 6.43 1.24 4.23 2.82 2.36 0.64 2.46 5.40 1.05 0.01 4.83 3.3022
2009 5.74 8.65 6.46 6.81 5.63 5.20 4.79 3.87 5.31 5.48 5.61 6.27 5.8175
2008 N/A N/A N/A N/A N/A N/A N/A 4.99 5.00 5.30 5.34 7.03 5.5320
Wind Run(NM's)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 0.0 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.00
2011 5320.0 6425.2 7052.5 7953.6 5647.6 4850.5 4524.7 5673.8 4114.4 2879.0 1044.5 1659.6 57145.44
2010 8040.4 5718.6 1101.2 4018.6 2781.6 2252.4 507.7 2309.6 5148.4 1036.8 7.2 4762.3 37684.96
2009 5652.5 7702.2 6348.1 6491.8 5551.4 4957.7 4720.8 3809.7 5061.0 5394.7 5352.3 6176.0 67218.12
2008 N/A N/A N/A N/A N/A N/A N/A 4914.0 4764.4 5218.9 5102.9 6930.8 26931.05
Pressure (in Hg) (Maximum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 30.44 30.67 30.42 30.31 30.21 30.21 30.24 30.41 30.55 30.24 30.69 30.3271
2010 30.44 30.37 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.6759
2009 30.68 30.51 30.55 30.46 30.49 30.19 30.32 30.25 30.34 30.35 30.43 30.61 30.4318
2008 N/A N/A N/A N/A N/A N/A N/A 30.34 30.47 30.64 30.52 30.71 30.5361
Pressure (in Hg) (Minimum)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 29.35 29.45 29.26 29.49 -0.00 29.72 29.24 29.75 29.47 29.66 29.53 27.0376
2010 29.23 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.5050
2009 29.20 29.44 29.29 29.18 29.68 29.52 29.64 29.71 29.46 29.60 29.65 29.24 29.4676
2008 N/A N/A N/A N/A N/A N/A N/A 29.53 29.55 29.68 29.33 29.33 29.4841
Pressure (in Hg) (Average)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Av.
2012 29.53 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 29.5300
2011 29.53 30.03 30.12 29.93 29.94 29.91 29.95 29.89 30.02 29.98 30.09 29.81 29.9344
2010 30.04 30.10 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.53 29.6197
2009 30.05 30.10 30.17 29.98 30.05 29.86 29.95 30.03 30.09 30.05 30.11 30.10 30.0455
2008 N/A N/A N/A N/A N/A N/A N/A 29.97 30.10 30.17 30.07 30.14 30.0885
Precipitation (in) (Total)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Annual Tot.
2012 0.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.00
2011 0.00 0.07 0.24 0.32 0.14 0.07 0.08 0.91 1.90 1.38 0.02 0.12 5.22
2010 1.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.08
2009 1.31 0.10 0.94 2.64 8.98 5.79 2.79 2.14 1.98 12.18 1.93 5.60 46.37
2008 N/A N/A N/A N/A N/A N/A N/A 0.91 7.64 1.07 1.56 1.81 12.98
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