O'Fallon, Illinois, United States Climate

Weather: 15.33°C/59.59°F, Wind SW at 5.14 km/h, 38% Humidity, 0% Chance of rain

United States
(Photo by Julia Raasch on Unsplash)
Contents

O'Fallon Climate Summary

Located at an elevation of None meters (0 feet) above sea level, O'Fallon has a Humid subtropical, no dry season climate (Classification: Cfa). The district’s yearly temperature is 14.17ºC (57.51ºF) and it is 1.53% higher than United States’s averages. O'Fallon typically receives about 24.97 millimeters (0.98 inches) of precipitation and has 38.38 rainy days (10.52% of the time) annually.

CountryUnited States
CityIllinois
Longitude-89.910991
Latitude38.592323
Attitude/ElevationNonem (0ft)
Local timeFriday 23:54
Annual high temperature17.45ºC (63.41ºF)
Annual low temperature9.15ºC (48.47ºF)
Average annual precip.24.97mm (0.98in)
Warmest monthJuly (29.49ºC / 85.08ºF)
Coldest MonthJanuary (-3.24ºC / 26.17ºF)
Wettest MonthJune (39.95mm / 1.57in)
Driest MonthNovember (14.65mm / 0.58in)
Number of days with rainfall (≥ 1.0 mm)38.38 days (10.52%)
Days with no rain326.62 days (89.48%)
Humidity75.24%

Climate O'Fallon: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)17.0(62.6)26.0(78.8)24.0(75.2)26.0(78.8)33.0(91.4)34.0(93.2)35.0(95.0)34.0(93.2)33.0(91.4)33.0(91.4)23.0(73.4)19.0(66.2)35.0(95.0)
Average high °C (°F)3.53(38.35)6.32(43.38)11.03(51.85)16.08(60.94)24.23(75.61)28.66(83.59)29.49(85.08)28.05(82.49)26.59(79.86)18.29(64.92)10.16(50.29)6.92(44.46)17.45(63.41)
Daily mean °C (°F)0.81(33.46)3.22(37.8)7.76(45.97)12.41(54.34)21.01(69.82)25.28(77.5)26.28(79.3)24.67(76.41)22.68(72.82)14.66(58.39)6.97(44.55)4.25(39.65)14.17(57.51)
Average low °C (°F)-3.24(26.17)-1.42(29.44)2.95(37.31)6.72(44.1)15.33(59.59)19.32(66.78)20.76(69.37)19.41(66.94)17.29(63.12)9.55(49.19)2.57(36.63)0.53(32.95)9.15(48.47)
Record low °C (°F)-19.0(-2.2)-13.0(8.6)-14.0(6.8)-4.0(24.8)2.0(35.6)11.0(51.8)15.0(59.0)12.0(53.6)7.0(44.6)-1.0(30.2)-13.0(8.6)-10.0(14.0)-19.0(-2.2)
Average precipitation mm (inches)17.0(0.67)19.0(0.75)22.26(0.88)23.87(0.94)31.29(1.23)39.95(1.57)39.26(1.55)38.47(1.51)18.75(0.74)19.31(0.76)14.65(0.58)15.87(0.62)24.97(0.98)
Average precipitation days (≥ 1.0 mm)2.02.642.913.184.274.554.824.552.912.731.911.913.2
Average relative humidity (%)73.5473.0472.7672.0276.7275.5281.4482.9577.2869.2373.0175.3775.24
Mean monthly sunshine hours6.648.118.89.5512.6413.613.5110.7110.739.376.936.559.76

Climate Graph

The chart below shows the mean monthly temperature and precipitation of O'Fallon in recent years.

O'Fallon

O'Fallon Temperature by Month

July
26.28°C | 79.3°F
June
25.28°C | 77.5°F
August
24.67°C | 76.41°F
September
22.68°C | 72.82°F
May
21.01°C | 69.82°F
October
14.66°C | 58.39°F
April
12.41°C | 54.34°F
March
7.76°C | 45.97°F
November
6.97°C | 44.55°F
December
4.25°C | 39.65°F
February
3.22°C | 37.8°F
January
0.81°C | 33.46°F

Historical Data

Summary
  • 2020
  • 2019
  • 2018
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
TemperatureMaxAverageMin
Max Temperature31.0°C (87.8°F)20.16°C (68.29°F)9.0°C (48.2°F)
Avg Temperature27.0°C (80.6°F)17.39°C (63.3°F)9.0°C (48.2°F)
Min Temperature21.0°C (69.8°F)12.42°C (54.36°F)2.0°C (35.6°F)
Dew PointMaxAverageMin
Dew Point21.0°C (69.8°F)12.9°C (55.22°F)-1.0°C (30.2°F)
PrecipitationMaxAverageMinSum
Precipitation24.8mm | 0.98in3.19mm | 0.13in0.0mm | 0in99.0mm | 3.9in
Snowdepth0.0mm | 0in0.0mm | 0in0.0mm | 0in0.0mm | 0in
WindMaxAverageMin
Wind24.0kmh | 14.91mph13.52kmh | 8.4mph7.0kmh | 4.35mph
Gust Wind34.0kmh | 21.13mph20.97kmh | 13.03mph10.0kmh | 6.21mph
Sea Level PressureMaxAverageMin
Sea Level Pressure24.8mb3.19mb0.0mb
O'Fallon

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
May° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2020-05-0116 | 60.810 | 50.0749 | 5.5929.94 | 10140.0 | 0.0
2020-05-0222 | 71.617 | 62.68112 | 7.4629.88 | 10125.8 | 0.23
2020-05-0316 | 60.814 | 57.28512 | 7.4629.94 | 10149.7 | 0.38
2020-05-0415 | 59.010 | 50.07812 | 7.4629.97 | 10152.5 | 0.1
2020-05-0515 | 59.012 | 53.68618 | 11.1829.85 | 10110.9 | 0.04
2020-05-0612 | 53.66 | 42.87310 | 6.2130.12 | 10200.0 | 0.0
2020-05-0715 | 59.08 | 46.47310 | 6.2130.09 | 10191.3 | 0.05
2020-05-0811 | 51.86 | 42.87724 | 14.9129.97 | 101524.8 | 0.98
2020-05-099 | 48.2-1 | 30.2578 | 4.9730.27 | 10250.0 | 0.0
2020-05-1010 | 50.05 | 41.07421 | 13.0530.12 | 10200.7 | 0.03
2020-05-1110 | 50.03 | 37.46913 | 8.0830.27 | 10250.0 | 0.0
2020-05-129 | 48.25 | 41.0827 | 4.3530.27 | 10250.4 | 0.02
2020-05-1311 | 51.89 | 48.29114 | 8.730.15 | 10210.8 | 0.03
2020-05-1421 | 69.817 | 62.68722 | 13.6729.94 | 10144.3 | 0.17
2020-05-1522 | 71.619 | 66.28616 | 9.9429.88 | 101218.5 | 0.73
2020-05-1622 | 71.617 | 62.6829 | 5.5929.91 | 10134.3 | 0.17
2020-05-1723 | 73.418 | 64.48215 | 9.3229.88 | 10122.6 | 0.1
2020-05-1815 | 59.012 | 53.68614 | 8.729.77 | 10080.8 | 0.03
2020-05-1915 | 59.013 | 55.49015 | 9.3229.83 | 10101.0 | 0.04
2020-05-2017 | 62.615 | 59.09015 | 9.3229.91 | 10130.2 | 0.01
2020-05-2115 | 59.013 | 55.4879 | 5.5929.97 | 10150.2 | 0.01
2020-05-2220 | 68.016 | 60.8849 | 5.5929.94 | 10140.5 | 0.02
2020-05-2325 | 77.020 | 68.08415 | 9.3229.91 | 10135.6 | 0.22
2020-05-2427 | 80.621 | 69.88014 | 8.729.91 | 10134.1 | 0.16
2020-05-2526 | 78.820 | 68.08113 | 8.0829.91 | 10131.1 | 0.04
2020-05-2625 | 77.020 | 68.08217 | 10.5629.94 | 10142.3 | 0.09
2020-05-2720 | 68.018 | 64.49215 | 9.3229.91 | 10132.9 | 0.11
2020-05-2820 | 68.018 | 64.49011 | 6.8429.88 | 10123.0 | 0.12
2020-05-2919 | 66.214 | 57.27918 | 11.1830.03 | 10170.7 | 0.03
2020-05-3017 | 62.612 | 53.67712 | 7.4630.18 | 10220.0 | 0.0
2020-05-3119 | 66.213 | 55.47510 | 6.2130.21 | 10230.0 | 0.0

O'Fallon 3 Year Historical Weather Data

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