Janesville, WI weather and climate in 2024
Day
21 °C
Night
8 °C
Sea
6 °C
Precipitation
88 mm
in month
Rainy days
12 days
in month
Daylight
14 hours
average
Sunshine
9 hours
average
Humidity
66 %
Day
21 °C
Night
8 °C
Sea
6 °C
Precipitation
88 mm
in month
Rainy days
12 days
in month
Daylight
14 hours
average
Sunshine
9 hours
average
Humidity
66 %
Overview: Janesville, WI
Weather charts for Janesville, WI
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Weather overview for Janesville, WI
Weather overview
Janesville, located in Wisconsin, USA, experiences a humid continental climate with four distinct seasons. The city sees mild to hot summers with an average high temperature of 28 °C (83 °F) in July. In contrast, chilly winters bring an average low of -11 °C (11 °F) in January. Precipitation varies throughout the year with typical rainfall during summer while snow is common in the winter months. The area doesn’t have a dry or wet season like tropical climates, but rain distribution varies, with the highest rainfall of 108 mm (4.27 in) in June.
January weather
January in Janesville is known for its cold weather, with daytime highs averaging around -2 °C (28 °F) and a significant chance of snow. Nights can be particularly freezing, with temperatures dropping to an average low of -11 °C (11 °F).
February weather
With the arrival of February, Janesville remains cold, but days begin to get slightly warmer with an average high temperature of 1 °C (33 °F). Nighttime temperatures averagely stay around -9 °C (15 °F).
March weather
March sees the onset of spring with a noticeable increase in daytime temperatures up to 7 °C (45 °F); however, nights remain cold with an average low of -3 °C (26 °F).
April weather
April offers a more comfortable climate with an average high of 15 °C (58 °F) during the day, while the humidity starts to drop, making for pleasant conditions. The nighttime temperature averages at 3 °C (37 °F).
May weather
In May, Janesville sees a significant warm-up with daily high temperatures averaging 21 °C (70 °F), yet the evenings provide a cooler respite at an average low of 8 °C (47 °F).
June weather
June ushers in the start of summer with the highest average temperatures of the year peaking at 26 °C (79 °F) during the day. Nighttime remains comfortable with an average low of 14 °C (57 °F).
July weather
July sees the mercury rise even further with the warmest average high temperature of 28 °C (83 °F), earning its title as the pinnacle of summer heat in Janesville. Nighttime temperatures linger at a mild 16 °C (62 °F).
August weather
August slightly cools from the July high, with an average daytime temperature of 27 °C (81 °F). Despite the lower high temperatures, nights remain nearly as warm as July with an average low of 16 °C (60 °F).
September weather
September brings the onset of fall with daytime temperatures starting to decrease to an average high of 24 °C (74 °F). Nights become noticeably cooler, with lows averaging around 11 °C (51 °F).
October weather
October in Janesville sees a continued drop in temperatures with daily highs averaging around 16 °C (61 °F), and cooler nights averaging at 4 °C (39 °F).
November weather
November marks a significant cooling period in Janesville with the onset of winter weather conditions. Average high temperatures reach only around 8 °C (46 °F) during the day while nights cool down to an average low of -2 °C (29 °F).
December weather
December brings the full onset of winter with chilly days bearing an average high of only 0 °C (32 °F) and cold nights with temperatures averaging -8 °C (17 °F).
FAQs
How many layers of clothing are suggested for Janesville's January weather?
In Janesville during January, it's wise to dress in multiple layers to stay warm, especially since daytime highs only reach around -2 °C (28 °F), and nighttime lows plummet to -11 °C (11 °F). Insulating layers and a good quality winter jacket, along with gloves and a hat, are essential.
Are there any warmer days in Janesville during February?
While February in Janesville is still very much winter, you might experience occasional slightly warmer days with average high temperatures just above freezing at 1 °C (33 °F).
As Janesville thaws in March, how do the temperature changes affect outdoor activities?
The warmer temperatures in March, averaging 7 °C (45 °F), encourage more outdoor activities in Janesville such as walking and jogging, although nights are still cold with temperatures around -3 °C (26 °F).
Does April weather in Janesville allow for t-shirt days, or is a jacket still necessary?
April in Janesville starts to bring milder days with highs of 15 °C (58 °F), suitable for lighter layers or a t-shirt, but the evenings can still be cool averaging 3 °C (37 °F), so having a jacket handy is advisable.
With May's warming trend, what's the likelihood of needing air conditioning in Janesville?
As the average high in May reaches 21 °C (70 °F), the use of air conditioning in Janesville starts to become more common, especially during sunnier afternoons or for those preferring cooler indoor temperatures.
Is June typically the hottest month in Janesville, and how should residents prepare?
June indeed brings the heat to Janesville, with daytime highs peaking at 26 °C (79 °F). Residents generally prepare by ensuring they have functional air conditioning and by staying hydrated.
What are some ways to beat the July heat in Janesville, especially during the peak temperatures?
Beating the July heat in Janesville involves staying indoors during peak heat, enjoying air-conditioned environments, taking a dip in nearby lakes or pools, and consuming plenty of cold beverages.
As temperatures start to decline in August, does outdoor activity in Janesville increase?
The cooler temperatures of August do often encourage more outdoor activity in Janesville, such as evening walks or attending local outdoor events.
Is the September climate in Janesville conducive to fall festivals and outdoor events?
September in Janesville is indeed perfect for fall festivals and outdoor events with comfortable temperatures and the refreshing change in the air as autumn sets in.
What is the likelihood of experiencing Indian summer days in Janesville during October?
Indian summer, characterized by unseasonably warm and clear days after a frost, can sometimes be experienced in October in Janesville, providing a last hint of warmth before winter.
How early does Janesville begin to feel the chill of winter in November?
The chill of winter begins to set in as early as November in Janesville, with a noticeable drop in temperatures and the first instances of frost and occasional snowfall.
In the heart of winter, how do Janesville residents cope with the cold temperatures of December?
Janesville residents cope with December's cold by donning warm winter coats, using heating systems more frequently, and participating in winter sports and holiday events that embrace the season.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.