MONTHLY CLIMATOLOGICAL SUMMARY for JAN. 2012 NAME: Westlawn CITY: Fairfax County STATE: VA ELEV: 328 ft LAT: 38° 51' 30" N LONG: 77° 10' 50" W TEMPERATURE (°F), RAIN (in), WIND SPEED (mph) HEAT COOL AVG MEAN DEG DEG WIND DOM DAY TEMP HIGH TIME LOW TIME DAYS DAYS RAIN SPEED HIGH TIME DIR ------------------------------------------------------------------------------------ 1 45.9 56.9 3:00p 32.4 9:00a 19.1 0.0 0.03 1.4 18.0 10:30p SSW 2 38.0 49.5 12:30a 31.3 12:00m 27.0 0.0 0.00 3.4 23.0 12:00p W 3 26.9 31.3 12:30a 21.3 11:00p 38.1 0.0 0.00 3.3 24.0 1:00p NW 4 23.6 32.4 12:00m 14.4 7:00a 41.4 0.0 0.00 0.3 14.0 12:30a SSW 5 35.6 45.5 3:30p 27.6 3:00a 29.4 0.0 0.00 0.7 17.0 2:00p WNW 6 43.7 60.5 5:30p 29.8 1:00a 21.3 0.0 0.00 0.3 13.0 2:00p SSW 7 48.1 65.6 2:00p 33.2 9:00a 16.9 0.0 0.00 0.3 13.0 2:00p WSW 8 43.1 48.6 2:30p 32.7 12:00m 21.9 0.0 0.00 0.6 15.0 2:00p N 9 33.5 38.9 12:30p 29.3 7:00a 31.5 0.0 0.16 0.0 6.0 10:30a S 10 37.6 50.1 4:30p 30.3 9:00a 27.4 0.0 0.00 0.3 14.0 3:30p W 11 37.1 46.2 12:00m 28.5 6:30a 27.9 0.0 0.50 0.7 17.0 9:00p ENE 12 48.7 55.9 4:30p 40.9 9:00a 16.3 0.0 1.13 1.4 17.0 11:30p SSW 13 37.8 51.1 12:30a 28.4 12:00m 27.2 0.0 0.01 3.9 29.0 11:30a W 14 29.4 36.5 3:00p 23.3 10:00a 35.6 0.0 0.00 0.5 15.0 11:30a WNW 15 27.5 31.9 4:00p 21.8 12:00m 37.5 0.0 0.00 0.5 17.0 11:00a N 16 29.2 39.3 10:00p 19.2 4:30a 35.8 0.0 0.06 0.6 22.0 1:00p SSW 17 47.8 57.3 5:30p 37.5 12:30a 17.2 0.0 0.22 1.8 18.0 5:30p SSW 18 39.9 55.9 12:30a 26.7 12:00m 25.1 0.0 0.00 3.6 23.0 2:30p NW 19 29.7 37.8 3:00p 17.1 8:00a 35.3 0.0 0.00 0.7 15.0 3:00p SSW 20 32.6 37.6 12:30a 29.4 12:00m 32.4 0.0 0.02 1.0 16.0 11:00a N 21 29.7 31.6 4:00p 27.0 2:30a 35.3 0.0 0.30 1.1 13.0 5:00p N 22 29.6 30.6 1:00p 28.2 7:30a 35.4 0.0 0.00 1.1 11.0 12:30a NE 23 34.5 42.2 12:00m 30.1 12:30a 30.5 0.0 0.02 0.9 14.0 8:00p SSW 24 45.1 54.5 4:30p 37.6 10:30p 19.9 0.0 0.00 0.7 10.0 12:30p W 25 41.8 48.9 3:00p 34.7 8:00a 23.2 0.0 0.00 1.0 18.0 10:00a N 26 46.7 54.1 12:00m 39.8 3:30a 18.3 0.0 0.00 0.2 9.0 1:30p S 27 54.1 62.3 12:30p 41.9 12:00m 10.9 0.0 0.32 4.3 26.0 4:30p NW 28 42.0 52.8 4:30p 30.0 8:00a 23.0 0.0 0.00 1.6 22.0 7:30p SSW 29 38.6 46.4 3:30p 28.2 7:30a 26.4 0.0 0.00 1.9 23.0 11:00p SSW 30 37.8 44.9 4:00p 31.0 7:00a 27.2 0.0 0.00 2.0 17.0 12:30a W 31 49.7 63.5 4:00p 36.5 7:00a 15.3 0.0 0.00 1.0 17.0 4:00p SSW ------------------------------------------------------------------------------------- 38.2 65.6 7 14.4 4 829.7 0.0 2.77 1.3 29.0 13 SSW Max >= 90.0: 0 Max <= 32.0: 4 Min <= 32.0: 21 Min <= 0.0: 0 Max Rain: 1.13 ON 01/12/12 Days of Rain: 10 (>.01 in) 6 (>.1 in) 1 (>1 in) Heat Base: 65.0 Cool Base: 65.0 Method: Integration