Janesville (WI) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Janesville (WI). The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

Janesville is known for its substantial rain/snowfall, with annual precipitation reaching 1013 mm.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

The seasons in Janesville, bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 139 mm of precipitation.

This rainfall is distributed across 13 rainy days. In contrast, the driest month, January, experiences much less snowfall, totaling 36 mm over 10 snowy days. These distinct seasonal differences provide diverse experiences throughout the year.

June, the city’s wettest month, has a maximum daytime temperature of 26°C. During the driest month January you can expect a temperature of -2°C. For more detailed insights into the city’s temperatures, visit our Janesville Temperature page.

Annual Precipitation in the United States of America

The map below shows the annual precipitation across the United States of America. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Janesville’s average annual precipitation is 1013 mm. Let’s compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm, spread fairly evenly throughout the year.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Kuala Lumpur, Malaysia, receives 2529 mm of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Interesting weather facts

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

For more detailed information about Janesville (WI)’s weather, including sunshine hours, humidity levels, and temperature data, visit our Janesville (WI) Climate page.