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Climate & Weather Averages in Janesville, Wisconsin, USA

Currently: 72 °F. Clear. (Weather station: Janesville / Rock County, USA). See more current weather

Annual Weather Averages Near Janesville

Averages are for Janesville / Rock County, which is 4 miles from Janesville.

Based on weather reports collected during 1992–2021.

All Year Climate & Weather Averages in Janesville

High Temp: 83 °F

Low Temp: 12 °F

Mean Temp: 48 °F

Precipitation: 3.09"

Humidity: 74%

Dew Point: 40 °F

Wind: 15 mph

Pressure: 30.02 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Janesville

High Temp: 29 °F

Low Temp: 12 °F

Mean Temp: 20 °F

Precipitation: 1.70"

Humidity: 80%

Dew Point: 17 °F

Wind: 17 mph

Pressure: 30.08 "Hg

Visibility: 8 mi

February Climate & Weather Averages in Janesville

High Temp: 32 °F

Low Temp: 15 °F

Mean Temp: 23 °F

Precipitation: 1.64"

Humidity: 76%

Dew Point: 19 °F

Wind: 17 mph

Pressure: 30.07 "Hg

Visibility: 9 mi

March Climate & Weather Averages in Janesville

High Temp: 44 °F

Low Temp: 25 °F

Mean Temp: 35 °F

Precipitation: 1.98"

Humidity: 72%

Dew Point: 27 °F

Wind: 17 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

April Climate & Weather Averages in Janesville

High Temp: 58 °F

Low Temp: 35 °F

Mean Temp: 47 °F

Precipitation: 3.53"

Humidity: 66%

Dew Point: 35 °F

Wind: 18 mph

Pressure: 29.96 "Hg

Visibility: 9 mi

May Climate & Weather Averages in Janesville

High Temp: 70 °F

Low Temp: 47 °F

Mean Temp: 58 °F

Precipitation: 4.04"

Humidity: 69%

Dew Point: 47 °F

Wind: 16 mph

Pressure: 29.96 "Hg

Visibility: 10 mi

June Climate & Weather Averages in Janesville

High Temp: 80 °F

Low Temp: 58 °F

Mean Temp: 69 °F

Precipitation: 4.85"

Humidity: 72%

Dew Point: 58 °F

Wind: 13 mph

Pressure: 29.94 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Janesville

High Temp: 83 °F

Low Temp: 62 °F

Mean Temp: 72 °F

Precipitation: 4.21"

Humidity: 76%

Dew Point: 63 °F

Wind: 12 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

August Climate & Weather Averages in Janesville

High Temp: 82 °F

Low Temp: 60 °F

Mean Temp: 71 °F

Precipitation: 4.33"

Humidity: 78%

Dew Point: 62 °F

Wind: 10 mph

Pressure: 30.01 "Hg

Visibility: 9 mi

September Climate & Weather Averages in Janesville

High Temp: 75 °F

Low Temp: 51 °F

Mean Temp: 63 °F

Precipitation: 3.62"

Humidity: 75%

Dew Point: 54 °F

Wind: 12 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

October Climate & Weather Averages in Janesville

High Temp: 62 °F

Low Temp: 39 °F

Mean Temp: 51 °F

Precipitation: 3.03"

Humidity: 74%

Dew Point: 42 °F

Wind: 14 mph

Pressure: 30.03 "Hg

Visibility: 9 mi

November Climate & Weather Averages in Janesville

High Temp: 46 °F

Low Temp: 29 °F

Mean Temp: 38 °F

Precipitation: 2.22"

Humidity: 76%

Dew Point: 30 °F

Wind: 16 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

December Climate & Weather Averages in Janesville

High Temp: 34 °F

Low Temp: 19 °F

Mean Temp: 26 °F

Precipitation: 1.91"

Humidity: 81%

Dew Point: 22 °F

Wind: 16 mph

Pressure: 30.06 "Hg

Visibility: 8 mi

Quick Climate Info

Hottest MonthJuly (72 °F avg)
Coldest MonthJanuary (20 °F avg)
Wettest MonthJune (4.85" avg)
Windiest MonthApril (18 mph avg)
Annual precip.37.06" (per year)

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