Monthly weather forecast and climate
Janesville, CA

Weather in January

January, like December, in Janesville, California, is a wintry winter month, with average temperature fluctuating between 38.1°F (3.4°C) and 23.2°F (-4.9°C). In January, the average high-temperature is essentially the same as in December - a still wintry 38.1°F (3.4°C). Weather in January »

Weather in February

February, the last month of the winter, in Janesville, is also a wintry month, with average temperature fluctuating between 40.3°F (4.6°C) and 24.8°F (-4°C). In February, the average high-temperature is relatively the same as in January - a still cold 40.3°F (4.6°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Janesville, California, with average temperature ranging between min 28.2°F (-2.1°C) and max 45.1°F (7.3°C). In Janesville, the average high-temperature is relatively the same as in February - a frosty 45.1°F (7.3°C). Weather in March »

Weather in April

April is a cool spring month in Janesville, California, with temperature in the range of an average high of 53.4°F (11.9°C) and an average low of 32.7°F (0.4°C). In April, the average high-temperature slightly increases, from a chilly 45.1°F (7.3°C) in March, to a fresh 53.4°F (11.9°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Janesville, California, with average temperature fluctuating between 39.7°F (4.3°C) and 63°F (17.2°C). In May, the average high-temperature increases, from a cool 53.4°F (11.9°C) in April, to a comfortable 63°F (17.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Janesville, California, with average temperature fluctuating between 73.9°F (23.3°C) and 46.6°F (8.1°C). In June, the average high-temperature rises, from an enjoyable 63°F (17.2°C) in May, to a moderately hot 73.9°F (23.3°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Janesville, California, with average temperature varying between 52.7°F (11.5°C) and 84.6°F (29.2°C). July is the warmest month, with an average high-temperature of 84.6°F (29.2°C) and an average low-temperature of 52.7°F (11.5°C). Weather in July »

Weather in August

August, the last month of the summer, in Janesville, is also a moderately hot month, with average temperature varying between 83.5°F (28.6°C) and 51.4°F (10.8°C). In August, the average high-temperature is almost the same as in July - a still warm 83.5°F (28.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Janesville, California, with average temperature varying between 74.3°F (23.5°C) and 46.4°F (8°C). In Janesville, the average high-temperature in September drops, from a moderately hot 83.5°F (28.6°C) in August, to a still warm 74.3°F (23.5°C). Weather in September »

Weather in October

October, the same as September, in Janesville, California, is a moderate autumn month, with average temperature varying between 60.1°F (15.6°C) and 37.6°F (3.1°C). In October, the average high-temperature decreases, from a moderately hot 74.3°F (23.5°C) in September, to a mild 60.1°F (15.6°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Janesville, California, with average temperature fluctuating between 47.3°F (8.5°C) and 28.2°F (-2.1°C). In November, the average high-temperature decreases, from a moderate 60.1°F (15.6°C) in October, to a chilly 47.3°F (8.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Janesville, California, with average temperature varying between 36.9°F (2.7°C) and 22.6°F (-5.2°C). December is the coldest month, with an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 22.6°F (-5.2°C). Weather in December »
[Resources]

FAQ

What is the most humid month in Janesville?

With an average relative humidity of 81%, January is the most humid month.

How much does it rain in Janesville?

In Janesville, California, during the entire year, the rain falls for 97.2 days and collects up to 13.98" (355mm) of precipitation.

When does it snow in Janesville?

January through June, September through December are months with snowfall in Janesville.

How much does it snow in Janesville?

Throughout the year, in Janesville, there are 52.5 snowfall days, and 43.07" (1094mm) of snow is accumulated.

What is the month with the least sunshine in Janesville?

January and December, with an average of 5.8h of sunshine, are months with the least sunshine.

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

Months with the lowest UV index in Janesville are February and November, with an average maximum UV index of 1.

When are the longest days in Janesville?

June has the longest days of the year in Janesville, California, with an average of 15h of daylight.

When is the highest UV index in Janesville?

Months with the highest UV index in Janesville are June and July, with an average maximum UV index of 6.

What is the warmest month in Janesville?

July is the warmest month in Janesville, with an average high-temperature of 84.6°F (29.2°C) and an average low-temperature of 52.7°F (11.5°C).

What are the least humid months in Janesville?

Months with the lowest humidity are July and August, with an average relative humidity of 35%.

What is the driest month in Janesville?

The month with the least rainfall in Janesville, California, is July when the rain falls for 2.8 days and typically collects 0.12" (3mm) of precipitation.

When it does not snow in Janesville?

In Janesville, California, snow does not fall in July and August.

What month has the most sunshine in Janesville?

The month with the most sunshine in Janesville is July, with an average of 12.1h of sunshine.

What is the coldest month in Janesville?

With an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 22.6°F (-5.2°C), December is the coldest month in Janesville.

What is the rainiest month in Janesville?

The month with the most rainfall is December when the rain falls for 10.8 days and typically aggregates up to 2.28" (58mm) of precipitation.

What is the snowiest month in Janesville?

December is the month with the most snowfall. Snow falls for 11.4 days and accumulates 10.16" (258mm) of snow.

What is the month with the shortest days in Janesville?

The month with the shortest days in Janesville is December, with an average of 9.4h of daylight.

Average temperature
Janesville, CA

Average temperature - Janesville, CA

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is December (36.9°F).

The month with the highest average low temperature is July (52.7°F).
The coldest month (with the lowest average low temperature) is December (22.6°F).

[Resources]

Average pressure
Janesville, CA

Average pressure - Janesville, CA

The month with the highest atmospheric pressure is January (30.2").
The month with the lowest atmospheric pressure is June (29.9").

[Resources]

Average wind speed
Janesville, CA

Average wind speed - Janesville, CA

The windiest month (with the highest average wind speed) is April (7.2mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

[Resources]

Average humidity
Janesville, CA

Average humidity - Janesville, CA

The month with the highest relative humidity is January (81%).
Months with the lowest relative humidity are July and August (35%).

[Resources]

Average rainfall
Janesville, CA

Average rainfall - Janesville, CA

The wettest month (with the highest rainfall) is December (2.28").
The driest month (with the least rainfall) is July (0.12").

[Resources]

Average rainfall days
Janesville, CA

Average rainfall days - Janesville, CA

The month with the highest number of rainy days is March (13.4 days).
Months with the least rainy days are July and August (2.8 days).

[Resources]

Average snowfall
Janesville, CA

Average snowfall - Janesville, CA

The month with the highest snowfall is December (10.16").
Months with the least snowfall are July and August (0").

[Resources]

Average snowfall days
Janesville, CA

Average snowfall days - Janesville, CA

The month with the highest number of snowfall days is December (11.4 days).
Months with the least snowfall days are July and August (0 days).

[Resources]

Average daylight / Average sunshine
Janesville, CA

Average daylight / Average sunshine - Janesville, CA

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January and December (Average sunshine: 5.8).

[Resources]

Average sunshine days
Janesville, CA

Average sunshine days - Janesville, CA

The month with the most sunshine days is August (26.2 days).
The month with the least sunshine days is March (12 days).

[Resources]

Average visibility
Janesville, CA

Average visibility - Janesville, CA

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

[Resources]