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Report for 2021
Annual Climatological Summary for 2021 Name: ofallonweather.com City: O'Fallon State: MO Elevation: 550 ft Lat: N 38° 50' 20" Lon: W 090° 43' 43" Temperature (°F), Heat Base: 65.0 Cool Base: 65.0 Dep. Heat Cool Max Max Min Min Mean Mean From Deg Deg >= <= <= <= YR MO Max Min Mean Norm Days Days Hi Date Low Date 90.0 32.0 32.0 0.0 ------------------------------------------------------------------------------------ 21 1 39.2 28.5 33.6 2.3 966 0 54.0 21 11.9 28 0 5 22 0 21 2 33.2 17.7 25.7 -9.1 1096 0 67.7 23 -4.2 16 0 14 23 4 21 3 60.0 41.7 50.5 5.8 456 9 78.6 27 28.4 2 0 0 4 0 21 4 65.8 46.3 55.9 -0.5 323 51 84.6 26 27.8 1 0 0 4 0 21 5 72.4 54.3 63.3 -2.9 163 112 87.1 26 38.0 10 0 0 0 0 21 6 85.9 67.2 76.3 1.0 8 344 97.9 18 53.1 22 8 0 0 0 21 7 86.2 68.5 77.1 -2.5 0 377 95.5 29 60.5 2 7 0 0 0 21 8 89.7 68.4 78.1 0.3 5 413 98.3 12 58.6 4 15 0 0 0 21 9 85.0 60.3 72.0 1.7 47 256 92.1 14 46.0 23 9 0 0 0 21 10 71.5 51.9 60.8 2.1 214 85 87.4 10 36.7 26 0 0 0 0 21 11 57.0 32.2 44.5 -0.9 619 5 77.1 8 17.4 26 0 0 16 0 21 12 56.4 33.6 44.4 9.4 645 8 75.0 3 18.4 19 0 1 12 0 ------------------------------------------------------------------------------------ 66.9 47.5 56.9 0.6 4548 1663 98.3 Aug -4.2 Feb 39 20 81 4 Precipitation (in) Dep. Max Days of Rain From Obs. >= YR MO Total Norm Day Date 0.01 0.10 1.00 --------------------------------------------- 21 1 3.12 0.92 1.30 30 13 5 1 21 2 1.76 -0.50 1.20 28 5 3 1 21 3 2.15 -1.20 1.05 18 7 4 1 21 4 4.73 0.88 1.28 7 11 6 3 21 5 4.06 -0.16 1.37 27 12 8 1 21 6 8.36 4.12 4.19 25 12 6 3 21 7 6.39 2.91 2.19 10 8 8 2 21 8 2.97 -0.04 1.13 12 7 4 1 21 9 1.10 -2.05 0.68 21 5 2 0 21 10 3.62 0.84 0.89 2 14 6 0 21 11 0.42 -2.51 0.28 25 4 1 0 21 12 3.04 0.61 1.59 28 11 4 1 --------------------------------------------- 41.72 3.82 4.19 Jun 109 57 14 Wind Speed (mph) Dom YR MO Avg. Hi Date Dir ------------------------------ 21 1 4.1 27.0 14 W 21 2 4.5 31.0 4 NNW 21 3 4.8 34.0 10 S 21 4 4.1 34.0 10 WSW 21 5 3.3 33.0 9 SSW 21 6 2.5 28.0 19 SW 21 7 2.1 36.0 15 WSW 21 8 2.8 41.0 12 SSW 21 9 3.3 23.0 26 SW 21 10 3.5 33.0 11 WSW 21 11 3.3 31.0 11 WSW 21 12 4.1 39.0 15 SW ------------------------------ 3.5 41.0 Aug WSW