ANNUAL CLIMATOLOGICAL SUMMARY NAME: Westlawn CITY: Fairfax County STATE: VA ELEV: 328 ft LAT: 38° 51' 30" N LONG: 77° 10' 50" W TEMPERATURE (°F), HEAT BASE 65.0, COOL BASE 65.0 DEP. HEAT COOL MEAN MEAN FROM DEG DEG MAX MAX MIN MIN YR MO MAX MIN MEAN NORM DAYS DAYS HI DATE LOW DATE >=90 <=32 <=32 <=0 ------------------------------------------------------------------------------------ 21 1 42.7 30.4 37.3 0.0 587 0 55.4 2 21.6 30 0 1 21 0 21 2 42.0 31.9 37.5 0.0 380 0 62.3 24 27.8 13 0 4 17 0 21 3 56.9 39.8 50.0 0.0 293 8 82.8 26 24.7 7 0 0 7 0 21 4 66.2 47.7 58.1 0.0 162 26 89.7 28 30.7 2 0 0 1 0 21 5 75.3 53.4 64.0 0.0 107 95 91.6 23 43.6 9 3 0 0 0 21 6 79.7 70.9 74.3 0.0 1 29 91.6 28 55.7 1 2 0 0 0 21 7 82.5 69.9 75.3 0.0 0 130 93.4 27 63.9 24 3 0 0 0 21 8 84.1 71.1 77.1 0.0 1 228 95.4 12 61.8 5 5 0 0 0 21 9 78.5 61.5 70.5 0.0 27 164 87.6 14 50.8 24 0 0 0 0 21 10 70.2 57.3 65.2 0.0 47 48 81.4 3 41.9 19 0 0 0 0 21 11 48.7 38.1 43.7 0.0 158 0 66.8 11 28.4 20 0 0 6 0 21 12 53.0 38.2 45.2 0.0 463 1 68.1 25 25.3 20 0 0 7 0 ------------------------------------------------------------------------------------ 64.6 50.0 57.7 0.0 2226 728 95.4 AUG 21.6 JAN 13 5 59 0 PRECIPITATION (in) DEP. MAX DAYS OF RAIN FROM OBS. OVER YR MO TOTAL NORM DAY DATE .01 .1 1 --------------------------------------------- 21 1 0.49 0.00 0.36 1 3 1 0 21 2 2.33 0.00 0.34 7 16 10 0 21 3 2.94 0.00 1.15 24 4 4 1 21 4 0.58 0.00 0.25 2 5 2 0 21 5 2.23 0.00 1.02 26 6 5 1 21 6 3.42 0.00 1.40 11 3 3 2 21 7 4.38 0.00 1.87 1 6 4 1 21 8 8.50 0.00 2.90 14 14 11 2 21 9 4.19 0.00 1.97 1 5 4 2 21 10 4.12 0.00 2.54 29 5 4 1 21 11 1.46 0.00 1.35 12 3 1 1 21 12 1.08 0.00 0.36 11 6 4 0 --------------------------------------------- 35.72 0.00 2.90 AUG 76 53 11 WIND SPEED (mph) DOM YR MO AVG. HI DATE DIR --------------------------------- 21 1 1.6 34.0 23 WNW 21 2 1.3 25.0 2 WNW 21 3 1.9 30.0 14 WNW 21 4 1.6 32.0 21 WNW 21 5 0.9 24.0 1 ESE 21 6 0.6 18.0 16 ENE 21 7 0.7 21.0 9 ENE 21 8 0.5 23.0 10 NE 21 9 0.6 20.0 2 NE 21 10 0.5 24.0 26 NE 21 11 1.1 30.0 26 NE 21 12 0.9 29.0 11 N --------------------------------- 1.0 34.0 JAN WNW