April Weather in Janesville, United States

Last updated: June 24, 2025

In April, the average temperature in Janesville, United States hovers around 8°C (47°F), with a notable range that can drop to a brisk -11°C (12°F) or rise to a warm 28°C (83°F). Expect about 75 mm (2.9 in) of precipitation spread over 9 days, contributing to an average humidity level of 81%. Prepare for a month of varied weather that keeps you on your toes!

April Temperature in Janesville

In April in Janesville, the average temperature is 8°C (47°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as -11°C (12°F). Be prepared for a wide range of temperatures if you plan to travel during this month!

April Weather in Janesville: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Janesville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Janesville, April typically has an average temperature of 8°C (47°F), with highs reaching up to 28°C (83°F) and lows dropping to around -11°C (12°F).

Data source: Temperature data for Janesville generated using information from the Copernicus Climate Change Service.

April Precipitation in Janesville

In Janesville, in April, the precipitation amount is 75 mm (2.9 in) spread over the course of 9 days.

April Precipitation Trends in Janesville

The chart displays monthly precipitation patterns in Janesville, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Janesville, April typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Janesville

In Janesville in April humidity is 81%. With an average temperature of 8°C (47°F), this humidity feels like a palpable heaviness in the air, making outdoor exploration feel damp and chilly, requiring travelers to bundle up and prepare for a brisk experience.

April Average Humidity in Janesville

This chart illustrates the average monthly humidity levels in Janesville, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Janesville is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Janesville

In Janesville in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Janesville.

Maximum UV Index Levels in Janesville for April

The chart shows the monthly maximum UV Index (UVI) for Janesville in April, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In April, the maximum UV index in Janesville typically reaches 8, which falls under the very high exposure category.

Data source: Janesville April UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How April Weather in Janesville Compares to Other Months

Weather in Janesville varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Janesville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Janesville, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	40 mm (1.6 inches)	82%	moderate
February Weather	-7°C (20°F)	50 mm (2.0 inches)	84%	moderate
March Weather	2°C (36°F)	72 mm (2.8 inches)	80%	moderate
April Weather	8°C (47°F)	75 mm (2.9 inches)	81%	very high
May Weather	16°C (61°F)	161 mm (6.3 inches)	74%	very high
June Weather	22°C (72°F)	126 mm (5.0 inches)	80%	extreme
July Weather	24°C (75°F)	97 mm (3.8 inches)	80%	very high
August Weather	22°C (71°F)	113 mm (4.5 inches)	77%	very high
September Weather	19°C (66°F)	116 mm (4.6 inches)	75%	very high
October Weather	10°C (51°F)	132 mm (5.2 inches)	80%	moderate
November Weather	2°C (36°F)	48 mm (1.9 inches)	87%	moderate
December Weather	-2°C (29°F)	35 mm (1.4 inches)	83%	moderate