ANNUAL CLIMATOLOGICAL SUMMARY NAME: SK CITY: Chesterfield STATE: MO 63017 ELEV: 500 ft LAT: 38° 24' 34" N LONG: 90° 17' 55" 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 ------------------------------------------------------------------------------------ 09 1 38.8 19.5 28.4 1.4 1118 0 61.8 9 -0.6 15 0 9 30 1 09 2 50.1 29.6 39.1 6.1 728 4 71.8 10 8.1 3 0 4 19 0 09 3 60.9 39.1 50.1 7.1 490 30 83.3 6 19.1 3 0 0 9 0 09 4 66.6 46.4 56.5 1.5 321 66 91.1 24 32.2 8 1 0 0 0 09 5 78.0 55.8 66.9 1.9 93 153 91.5 22 43.1 17 1 0 0 0 09 6 88.2 67.2 77.3 3.3 15 383 101.3 27 48.1 5 12 0 0 0 09 7 85.4 65.6 75.1 -2.9 6 317 96.1 9 56.5 20 7 0 0 0 09 8 86.9 65.5 75.3 -0.7 18 338 101.7 9 53.0 30 12 0 0 0 09 9 80.4 59.0 68.8 0.8 57 170 86.7 9 44.3 30 0 0 0 0 09 10 61.2 45.2 52.6 -3.4 393 10 77.4 20 28.2 18 0 0 1 0 09 11 61.3 42.5 51.7 7.7 412 14 81.4 7 28.9 27 0 0 2 0 09 12 40.1 25.9 32.6 0.6 999 0 58.2 1 10.6 10 0 8 24 0 ------------------------------------------------------------------------------------ 66.5 46.8 56.3 2.0 4650 1484 101.7 AUG -0.6 JAN 33 21 85 1 PRECIPITATION (in) DEP. MAX DAYS OF RAIN FROM OBS. OVER YR MO TOTAL NORM DAY DATE .01 .1 1 --------------------------------------------- 09 1 0.45 -1.39 0.14 29 4 3 0 09 2 2.00 -0.16 1.00 11 4 4 0 09 3 3.08 -0.14 0.91 28 8 7 0 09 4 3.59 0.03 1.06 9 12 8 1 09 5 4.93 0.55 1.46 25 14 11 2 09 6 5.23 1.40 1.96 15 12 8 2 09 7 4.59 1.02 2.03 4 8 5 2 09 8 3.51 0.27 1.32 17 6 5 1 09 9 4.20 1.17 1.85 5 9 6 2 09 10 13.27 10.43 2.80 8 15 14 5 09 11 2.82 -0.83 1.28 16 6 5 1 09 12 4.77 2.09 1.15 24 11 8 2 --------------------------------------------- 52.44 14.44 2.80 OCT 109 84 18 WIND SPEED (mph) DOM YR MO AVG. HI DATE DIR --------------------------------- 09 1 3.1 33.0 14 WNW 09 2 3.6 34.0 9 SSE 09 3 3.6 36.0 8 SE 09 4 3.5 28.0 21 WNW 09 5 1.6 30.0 15 ESE 09 6 1.6 27.0 2 ESE 09 7 1.3 25.0 12 ESE 09 8 1.8 24.0 19 ESE 09 9 1.0 25.0 28 NW 09 10 2.1 29.0 2 NW 09 11 2.1 22.0 25 S 09 12 3.3 34.0 9 S --------------------------------- 2.4 36.0 MAR WNW