Climate and monthly weather forecast
Janesville, IL

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Weather in January

January, like December, in Janesville, Illinois, is a wintry winter month, with an average temperature ranging between max 34°F (1.1°C) and min 21.9°F (-5.6°C). Janesville's coldest temperatures are experienced in January, with average high temperatures of 34°F (1.1°C) and lows of 21.9°F (-5.6°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Janesville, Illinois, with an average temperature varying between 39°F (3.9°C) and 26.1°F (-3.3°C). The onset of February brings an average high-temperature of a still icy 39°F (3.9°C), nearly matching the January temperature. Weather in February »

Weather in March

March, the first month of the spring in Janesville, is a cool month, with an average temperature ranging between max 51.1°F (10.6°C) and min 36.1°F (2.3°C). In March, the meteorological conditions change with the average high-temperature moving from an icy 39°F (3.9°C) in February to a cool 51.1°F (10.6°C). Weather in March »

Weather in April

April is a comfortable spring month in Janesville, Illinois, with an average temperature varying between 62.2°F (16.8°C) and 46.2°F (7.9°C). The arrival of April brings a temperature shift, with the average high-temperature escalating from a cool 51.1°F (10.6°C) in March to a comfortable 62.2°F (16.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Janesville, Illinois, with an average temperature fluctuating between 73°F (22.8°C) and 56.7°F (13.7°C). The shift from April to May brings an increase in the average high-temperature, moving from an enjoyable 62.2°F (16.8°C) to an agreeable 73°F (22.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Janesville, Illinois, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64.2°F (17.9°C). A subtle rise in the average high-temperature is observed during June, adjusting from an agreeable 73°F (22.8°C) in May to a warm 81.1°F (27.3°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Janesville, Illinois, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 65.8°F (18.8°C). The warmest period tends to be July, when average temperatures fluctuate between a high of 82°F (27.8°C) and a low of 65.8°F (18.8°C). The heat index value during July is appraised at a tropical 89.6°F (32°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Janesville, Illinois, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64°F (17.8°C). The commencement of August introduces an average high-temperature of a still moderately hot 81.1°F (27.3°C), closely mirroring the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Janesville, is also a moderately hot month, with an average temperature ranging between min 58.5°F (14.7°C) and max 77.2°F (25.1°C). Janesville's September showcases an average high-temperature of a still moderately hot 77.2°F (25.1°C), hardly distinct from August's 81.1°F (27.3°C). Weather in September »

Weather in October

October, like September, in Janesville, Illinois, is another enjoyable autumn month, with an average temperature varying between 48.2°F (9°C) and 63.9°F (17.7°C). Setting in of October comes with a decrease in the average high-temperature, moving from a moderately hot 77.2°F (25.1°C) in September to a refreshing 63.9°F (17.7°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Janesville, Illinois, with an average temperature ranging between max 49.8°F (9.9°C) and min 36.1°F (2.3°C). November weather is marked by a drop in the average high-temperature, falling from a refreshing 63.9°F (17.7°C) in October to a frosty 49.8°F (9.9°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Janesville, Illinois, with temperature in the range of an average high of 39°F (3.9°C) and an average low of 28.8°F (-1.8°C). As December commences, the average high-temperature shows a reduction, transitioning from a chilly 49.8°F (9.9°C) in November to a wintry 39°F (3.9°C). Weather in December »
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Frequently asked questions

What part of the year is the coldest in Janesville?

January, recording an average high temperature of 34°F (1.1°C) and a low temperature of 21.9°F (-5.6°C), is Janesville's coldest month.

How many days does it rain in Janesville?

In Janesville, Illinois, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.

When does it snow in Janesville?

Months with snowfall in Janesville, Illinois, are January through April, October through December.

How much does it snow in Janesville?

Throughout the year, in Janesville, there are 26.6 snowfall days, and 7.01" (178mm) of snow is accumulated.

What is the month with the least sunshine in Janesville?

With an average of 4h of sunshine, January has the least sunshine of the year in Janesville, Illinois.

What is the driest month in Janesville?

The month with the least rainfall in Janesville is February, when the rain falls for 7.8 days and typically collects 1.3" (33mm) of precipitation.

When is Daylight Saving Time (DST) in Janesville?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Janesville?

The month with the most rainfall in Janesville, Illinois, is April, when the rain falls for 14.9 days and typically aggregates up to 3.31" (84mm) of precipitation.

When it does not snow in Janesville?

In Janesville, snow does not fall in May through September.

When are the longest days in Janesville?

The month with the longest days in Janesville is June, with an average of 14h and 54min of daylight.

What month has the most sunshine in Janesville?

With an average of 10.3h of sunshine, June has the most sunshine of the year in Janesville, Illinois.

What is the month with the highest UV index in Janesville?

The months with the highest UV index in Janesville are June through August, with an average maximum UV index of 6.

What time of the year is the hottest in Janesville?

Janesville, Illinois, records the warmest temperatures in July, averaging a high of 82°F (27.8°C) and a low of 65.8°F (18.8°C).

What is the most humid month in Janesville?

July is the most humid month in Janesville, with an average relative humidity of 83%.

What is the least humid month in Janesville?

The least humid month in Janesville, Illinois, is October, with an average relative humidity of 70%.

When does it snow the most in Janesville?

The month with the most snowfall in Janesville is December, when snow falls for 6 days and typically aggregates up to 2.13" (54mm) of snow.

What is the month with the shortest days in Janesville?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

When is the lowest UV index in Janesville?

December is the month with the lowest UV index, with an average maximum UV index of 1.

Average pressure
Janesville, IL

Average pressure - Janesville, IL

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Janesville, IL

Average wind speed - Janesville, IL

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).

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Average rainfall
Janesville, IL

Average rainfall - Janesville, IL

The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").

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Average rainfall days
Janesville, IL

Average rainfall days - Janesville, IL

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall
Janesville, IL

Average snowfall - Janesville, IL

The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Janesville, IL

Average snowfall days - Janesville, IL

The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Janesville, IL

Average daylight / Average sunshine - Janesville, IL

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days
Janesville, IL

Average sunshine days - Janesville, IL

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).

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Average visibility
Janesville, IL

Average visibility - Janesville, IL

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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Janesville, Illinois, USA

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