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Climate & Weather Averages in St Clair, Missouri, USA

Currently: 70 °F. Clear. (Weather station: Washington Regional Airport, USA). See more current weather

Annual Weather Averages Near St Clair

Averages are for Washington Regional Airport, which is 17 miles from St Clair.

Based on weather reports collected during 1985–2015.

All Year Climate & Weather Averages in St Clair

High Temp: 89 °F

Low Temp: 21 °F

Mean Temp: 55 °F

Precipitation: 1.50"

Humidity: 69%

Dew Point: 45 °F

Wind: 6 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

January Climate & Weather Averages in St Clair

High Temp: 41 °F

Low Temp: 21 °F

Mean Temp: 31 °F

Precipitation: 0.89"

Humidity: 71%

Dew Point: 23 °F

Wind: 7 mph

Pressure: 30.15 "Hg

Visibility: 9 mi

February Climate & Weather Averages in St Clair

High Temp: 45 °F

Low Temp: 24 °F

Mean Temp: 35 °F

Precipitation: 0.85"

Humidity: 68%

Dew Point: 25 °F

Wind: 7 mph

Pressure: 30.13 "Hg

Visibility: 9 mi

March Climate & Weather Averages in St Clair

High Temp: 57 °F

Low Temp: 33 °F

Mean Temp: 45 °F

Precipitation: 1.68"

Humidity: 64%

Dew Point: 33 °F

Wind: 7 mph

Pressure: 30.07 "Hg

Visibility: 9 mi

April Climate & Weather Averages in St Clair

High Temp: 68 °F

Low Temp: 43 °F

Mean Temp: 56 °F

Precipitation: 2.06"

Humidity: 62%

Dew Point: 43 °F

Wind: 7 mph

Pressure: 29.97 "Hg

Visibility: 10 mi

May Climate & Weather Averages in St Clair

High Temp: 77 °F

Low Temp: 54 °F

Mean Temp: 65 °F

Precipitation: 2.60"

Humidity: 69%

Dew Point: 55 °F

Wind: 6 mph

Pressure: 29.96 "Hg

Visibility: 9 mi

June Climate & Weather Averages in St Clair

High Temp: 85 °F

Low Temp: 63 °F

Mean Temp: 74 °F

Precipitation: 2.03"

Humidity: 70%

Dew Point: 64 °F

Wind: 5 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

July Climate & Weather Averages in St Clair

High Temp: 89 °F

Low Temp: 67 °F

Mean Temp: 78 °F

Precipitation: 1.51"

Humidity: 70%

Dew Point: 68 °F

Wind: 5 mph

Pressure: 29.97 "Hg

Visibility: 9 mi

August Climate & Weather Averages in St Clair

High Temp: 88 °F

Low Temp: 65 °F

Mean Temp: 76 °F

Precipitation: 1.35"

Humidity: 71%

Dew Point: 66 °F

Wind: 4 mph

Pressure: 29.99 "Hg

Visibility: 8 mi

September Climate & Weather Averages in St Clair

High Temp: 80 °F

Low Temp: 56 °F

Mean Temp: 68 °F

Precipitation: 1.04"

Humidity: 71%

Dew Point: 58 °F

Wind: 4 mph

Pressure: 30.03 "Hg

Visibility: 9 mi

October Climate & Weather Averages in St Clair

High Temp: 69 °F

Low Temp: 44 °F

Mean Temp: 56 °F

Precipitation: 1.43"

Humidity: 68%

Dew Point: 45 °F

Wind: 5 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

November Climate & Weather Averages in St Clair

High Temp: 56 °F

Low Temp: 34 °F

Mean Temp: 45 °F

Precipitation: 1.37"

Humidity: 68%

Dew Point: 35 °F

Wind: 7 mph

Pressure: 30.11 "Hg

Visibility: 9 mi

December Climate & Weather Averages in St Clair

High Temp: 44 °F

Low Temp: 25 °F

Mean Temp: 35 °F

Precipitation: 1.19"

Humidity: 73%

Dew Point: 27 °F

Wind: 6 mph

Pressure: 30.14 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthJuly (78 °F avg)
Coldest MonthJanuary (31 °F avg)
Wettest MonthMay (2.60" avg)
Windiest MonthMarch (7 mph avg)
Annual precip.18.01" (per year)

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