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Climate & Weather Averages in DeKalb, Illinois, USA

Currently: 17 °C. Sunny. (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: 29 °C

Low Temp: -10 °C

Mean Temp: 9 °C

Precipitation: 70.8 mm

Humidity: 73%

Dew Point: 5 °C

Wind: 26 km/h

Pressure: 101.73 kPa

Visibility: 14 km

January Climate & Weather Averages in DeKalb

High Temp: -1 °C

Low Temp: -10 °C

Mean Temp: -5 °C

Precipitation: 37.7 mm

Humidity: 82%

Dew Point: -8 °C

Wind: 31 km/h

Pressure: 101.96 kPa

Visibility: 12 km

February Climate & Weather Averages in DeKalb

High Temp: 1 °C

Low Temp: -8 °C

Mean Temp: -3 °C

Precipitation: 38.5 mm

Humidity: 79%

Dew Point: -6 °C

Wind: 31 km/h

Pressure: 101.94 kPa

Visibility: 13 km

March Climate & Weather Averages in DeKalb

High Temp: 8 °C

Low Temp: -3 °C

Mean Temp: 3 °C

Precipitation: 50.2 mm

Humidity: 71%

Dew Point: -2 °C

Wind: 31 km/h

Pressure: 101.89 kPa

Visibility: 14 km

April Climate & Weather Averages in DeKalb

High Temp: 16 °C

Low Temp: 3 °C

Mean Temp: 9 °C

Precipitation: 89.9 mm

Humidity: 65%

Dew Point: 3 °C

Wind: 33 km/h

Pressure: 101.53 kPa

Visibility: 15 km

May Climate & Weather Averages in DeKalb

High Temp: 22 °C

Low Temp: 9 °C

Mean Temp: 15 °C

Precipitation: 105.0 mm

Humidity: 65%

Dew Point: 9 °C

Wind: 29 km/h

Pressure: 101.53 kPa

Visibility: 15 km

June Climate & Weather Averages in DeKalb

High Temp: 27 °C

Low Temp: 15 °C

Mean Temp: 21 °C

Precipitation: 102.9 mm

Humidity: 68%

Dew Point: 15 °C

Wind: 23 km/h

Pressure: 101.40 kPa

Visibility: 15 km

July Climate & Weather Averages in DeKalb

High Temp: 29 °C

Low Temp: 16 °C

Mean Temp: 23 °C

Precipitation: 82.8 mm

Humidity: 72%

Dew Point: 17 °C

Wind: 19 km/h

Pressure: 101.52 kPa

Visibility: 15 km

August Climate & Weather Averages in DeKalb

High Temp: 28 °C

Low Temp: 15 °C

Mean Temp: 22 °C

Precipitation: 87.7 mm

Humidity: 76%

Dew Point: 17 °C

Wind: 16 km/h

Pressure: 101.63 kPa

Visibility: 14 km

September Climate & Weather Averages in DeKalb

High Temp: 25 °C

Low Temp: 11 °C

Mean Temp: 18 °C

Precipitation: 72.2 mm

Humidity: 72%

Dew Point: 12 °C

Wind: 19 km/h

Pressure: 101.73 kPa

Visibility: 15 km

October Climate & Weather Averages in DeKalb

High Temp: 17 °C

Low Temp: 4 °C

Mean Temp: 11 °C

Precipitation: 78.0 mm

Humidity: 72%

Dew Point: 6 °C

Wind: 24 km/h

Pressure: 101.77 kPa

Visibility: 15 km

November Climate & Weather Averages in DeKalb

High Temp: 9 °C

Low Temp: -2 °C

Mean Temp: 4 °C

Precipitation: 57.4 mm

Humidity: 76%

Dew Point: 0 °C

Wind: 27 km/h

Pressure: 101.91 kPa

Visibility: 14 km

December Climate & Weather Averages in DeKalb

High Temp: 2 °C

Low Temp: -6 °C

Mean Temp: -2 °C

Precipitation: 47.3 mm

Humidity: 81%

Dew Point: -5 °C

Wind: 28 km/h

Pressure: 101.90 kPa

Visibility: 12 km

Quick Climate Info

Hottest Month July (23 °C avg)
Coldest Month January (-5 °C avg)
Wettest Month May (105.0 mm avg)
Windiest Month April (33 km/h avg)
Annual precip. 849.8 mm (per year)

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