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Annual Climatological Summary for 2025
Name: OFallon Weather City: OFallon State: MO
Elevation: 532 ft Lat: N 38° 50' 20" Lon: W 090° 43' 42"
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
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25 1 36.2 18.6 27.7 0.0 1156 0 57.7 29 -2.4 21 0 12 28 1
25 2 41.8 23.3 32.7 0.0 907 3 74.5 3 -2.6 20 0 8 20 1
25 3 65.0 39.0 52.0 0.0 437 36 83.3 14 17.8 2 0 0 10 0
25 4 67.6 45.6 56.4 0.0 254 48 85.3 13 28.2 8 0 0 1 0
25 5
25 6
25 7
25 8
25 9
25 10
25 11
25 12
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52.0 31.0 41.6 0.0 2753 86 85.3 Apr -2.6 Feb 0 20 59 2
Precipitation (in)
Dep. Max Days of Rain
From Obs. >=
YR MO Total Norm Day Date 0.01 0.10 1.00
---------------------------------------------
25 1 1.03 0.0 0.30 30 8 4 0
25 2 0.66 0.0 0.20 5 8 3 0
25 3 3.41 0.0 1.58 23 7 4 1
25 4 6.64 0.0 2.12 4 9 8 3
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11.74 0.0 2.12 Apr 32 19 4
Wind Speed (mph)
Dom
YR MO Avg. Hi Date Dir
------------------------------
25 1 4.7 25.0 1 W
25 2 4.5 28.0 14 WNW
25 3 5.9 51.0 19 SW
25 4 4.6 46.0 2 SSW
25 5
25 6
25 7
25 8
25 9
25 10
25 11
25 12
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4.9 51.0 Mar WSW