Janesville, Wisconsin 

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Climate in Janesville, Wisconsin

Janesville, Wisconsin gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Janesville averages 34 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 185 sunny days per year in Janesville. The US average is 205 sunny days.

Janesville gets some kind of precipitation, on average, 116 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 11
Rain: averages 36 inches of rain a year
Snow: averages 34 inches of snow a year


The annual BestPlaces Comfort Index for Janesville is 6.8 (10=best), which means it is one of the most pleasant places in Wisconsin.

6.8 / 10
June, August and September are the most pleasant months in Janesville, while January and December are the least comfortable months.

Climate Averages
  Janesville, WisconsinUnited States
  35.5 in.38.1 in.
  34.2 in.27.8 in.
  116.3 days106.2 days
  185 days205 days
  837 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Janesville with an average high temperature of 82.9°, which ranks it as warmer than most places in Wisconsin. In Janesville, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Janesville are June, August and September.

January has the coldest nighttime temperatures for Janesville with an average of 11.2°. This is warmer than most places in Wisconsin.

In Janesville, there are 8.7 days annually when the high temperature is over 90°, which is hotter than most places in Wisconsin.

In Janesville, there are 144.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Wisconsin.

In Janesville, there are 15.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Wisconsin.

August is the wettest month in Janesville with 4.4 inches of rain, and the driest month is January with 1.3 inches. The wettest season is Autumn with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 35.5 inches in Janesville means that it is wetter than most places in Wisconsin.

May is the rainiest month in Janesville with 11.7 days of rain, and February is the driest month with only 7.5 rainy days. There are 116.3 rainy days annually in Janesville, which is rainier than most places in Wisconsin. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 34.2 inches in Janesville means that it is one of the least snowy places in Wisconsin. January is the snowiest month in Janesville with 10.2 inches of snow, and 6 months of the year have significant snowfall.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Janesville    11 Reviews
    Town Sucks. Don't move here. - 1/5/2019
    My Wife and I have lived here for the last 2 years. Janesville is the pit of Hell. Nothing to do here, especially during the winter time. Closest places are 45 min to... Read More

    Start Your Review of Janesville

    semi-poor quality of life - 2/15/2016
    Janesville has pros and cons to living here depending on what is important to you. Janesville has a cheap cost of living and liberal-below average schools. Since you can... Read More

    Living in Janesville, WI - 3/13/2015
    I have lived in Janesville for 8 years and it is undisputedly, absolutely the worst place I have ever lived and I have lived in many cites from San Diego, Los Angeles,... Read More

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