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Climate & Weather Averages in DeKalb, Illinois, USA

Currently: 90 °F. Scattered clouds. (Weather station: De Kalb Taylor Municipal Airport, USA). See more current weather

Annual Weather Averages in DeKalb

Based on weather reports collected during 1992–2021.

All Year Climate & Weather Averages in DeKalb

High Temp: 84 °F

Low Temp: 15 °F

Mean Temp: 49 °F

Precipitation: 2.79"

Humidity: 73%

Dew Point: 41 °F

Wind: 16 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

January Climate & Weather Averages in DeKalb

High Temp: 31 °F

Low Temp: 15 °F

Mean Temp: 23 °F

Precipitation: 1.49"

Humidity: 82%

Dew Point: 18 °F

Wind: 19 mph

Pressure: 30.11 "Hg

Visibility: 7 mi

February Climate & Weather Averages in DeKalb

High Temp: 34 °F

Low Temp: 17 °F

Mean Temp: 26 °F

Precipitation: 1.52"

Humidity: 79%

Dew Point: 20 °F

Wind: 19 mph

Pressure: 30.10 "Hg

Visibility: 8 mi

March Climate & Weather Averages in DeKalb

High Temp: 47 °F

Low Temp: 27 °F

Mean Temp: 37 °F

Precipitation: 1.98"

Humidity: 71%

Dew Point: 29 °F

Wind: 19 mph

Pressure: 30.09 "Hg

Visibility: 9 mi

April Climate & Weather Averages in DeKalb

High Temp: 60 °F

Low Temp: 37 °F

Mean Temp: 48 °F

Precipitation: 3.54"

Humidity: 65%

Dew Point: 37 °F

Wind: 20 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

May Climate & Weather Averages in DeKalb

High Temp: 71 °F

Low Temp: 48 °F

Mean Temp: 60 °F

Precipitation: 4.14"

Humidity: 65%

Dew Point: 48 °F

Wind: 18 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

June Climate & Weather Averages in DeKalb

High Temp: 81 °F

Low Temp: 58 °F

Mean Temp: 70 °F

Precipitation: 4.05"

Humidity: 68%

Dew Point: 59 °F

Wind: 15 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

July Climate & Weather Averages in DeKalb

High Temp: 84 °F

Low Temp: 62 °F

Mean Temp: 73 °F

Precipitation: 3.26"

Humidity: 72%

Dew Point: 63 °F

Wind: 12 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

August Climate & Weather Averages in DeKalb

High Temp: 82 °F

Low Temp: 59 °F

Mean Temp: 71 °F

Precipitation: 3.45"

Humidity: 76%

Dew Point: 63 °F

Wind: 10 mph

Pressure: 30.01 "Hg

Visibility: 8 mi

September Climate & Weather Averages in DeKalb

High Temp: 76 °F

Low Temp: 51 °F

Mean Temp: 64 °F

Precipitation: 2.84"

Humidity: 72%

Dew Point: 54 °F

Wind: 12 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

October Climate & Weather Averages in DeKalb

High Temp: 63 °F

Low Temp: 40 °F

Mean Temp: 52 °F

Precipitation: 3.07"

Humidity: 72%

Dew Point: 43 °F

Wind: 15 mph

Pressure: 30.05 "Hg

Visibility: 9 mi

November Climate & Weather Averages in DeKalb

High Temp: 48 °F

Low Temp: 29 °F

Mean Temp: 39 °F

Precipitation: 2.26"

Humidity: 76%

Dew Point: 31 °F

Wind: 17 mph

Pressure: 30.09 "Hg

Visibility: 9 mi

December Climate & Weather Averages in DeKalb

High Temp: 36 °F

Low Temp: 20 °F

Mean Temp: 28 °F

Precipitation: 1.86"

Humidity: 81%

Dew Point: 23 °F

Wind: 17 mph

Pressure: 30.09 "Hg

Visibility: 7 mi

Quick Climate Info

Hottest MonthJuly (73 °F avg)
Coldest MonthJanuary (23 °F avg)
Wettest MonthMay (4.14" avg)
Windiest MonthApril (20 mph avg)
Annual precip.33.46" (per year)

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