Janesville (WI) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Janesville

Janesville average temperature chart (Celsius) Janesville average temperature chart (Fahrenheit)
Average monthly temperatures in Janesville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -3.9 -1.3 5.5 13.8 20.6 26 28.2 26.7 22.4 15.9 7.1 -1
°F 24.9 29.7 41.9 56.8 69.1 78.9 82.8 80.1 72.4 60.6 44.8 30.1

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Janesville monthly rainfall chart (mm) Janesville monthly rainfall chart (inches)
Average monthly rainfall in Janesville (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 31 28 57 83 81 103 103 104 94 67 58 46
inches 1.2 1.1 2.3 3.3 3.2 4.1 4 4.1 3.7 2.6 2.3 1.8
Rainy days 10 8 11 12 11 10 10 10 10 9 10 11

Average annual rainfall in Janesville: 808.167mm (318.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Janesville

Janesville average daily sunshine chart
Average daily sunshine Janesville
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.2 6 6.6 7.6 9.3 10.7 10.7 9.6 7.8 6.4 4.3 4.1

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Janesville average minimum / maximum temperatures (Celsius) Janesville average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Janesville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -14.1 -11.8 -4.8 1.8 7.5 12.9 15.7 14.2 9.5 3.4 -2.8 -10.4
Max °C -3.7 -1.1 5.8 14.1 21 26.4 28.6 27.1 22.8 16.2 7.4 -0.8
Min °F 6.6 10.9 23.5 35.2 45.4 55.1 60.2 57.5 49 38.1 27.1 13.3
Max °F 16 20.5 32.9 46.2 57.6 67.3 71.8 69.1 61 49.6 36.1 21.9

Sea temperature

The graph below shows the average sea temperature.

Janesville average sea temperature chart (Celsius) Janesville average sea temperature chart (Fahrenheit)
Average sea temperature around Janesville in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6 5.5 5.5 6.3 8.1 11.1 15.8 19.8 18.1 13.3 9.7 7.3
°F 42.8 41.9 42 43.4 46.5 52 60.5 67.7 64.7 55.9 49.4 45.2

Wind speed

The graph below shows the average wind speed.

Janesville average winspeed by month (km/h) Janesville average winspeed by month (mph)
Average wind speed in Janesville (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 18 19 20 17 16 14 14 15 17 18 18
mph 11 11 12 12 11 10 9 9 9 11 11 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Janesville relative humidity averages
Average relative humidity in Janesville
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
74% 73% 71% 66% 66% 67% 71% 74% 76% 72% 76% 78%

Other monthly averages

UV index Best time to go?

Janesville weather stats

Janesville weather statistics
Hottest month: July 28.2°C 82.8°F
Driest month: February 28mm 1.1ins
Sunniest month: July 10.7hrs
Coldest month: January -3.9°C 25°F
Wettest month: August 104mm 4.1ins
Warmest sea: August 19.8°C 67.6°F
Map showing location of Janesville (42.68279, -89.01872) Janesville map pin © Google

Locations nearby

Top United States locations