Climate and monthly weather forecastJanesville, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is a wintry winter month in Janesville, California, with an average temperature fluctuating between 38.1°F (3.4°C) and 23.2°F (-4.9°C). The onset of January marks an average high-temperature of a still icy 38.1°F (3.4°C), hardly differing from December's 36.9°F (2.7°C). Weather in January »Weather in February
February, the last month of the winter in Janesville, is also a wintry month, with an average temperature varying between 40.3°F (4.6°C) and 24.8°F (-4°C). February notes an average high-temperature of a still wintry 40.3°F (4.6°C), subtly differing from January's 38.1°F (3.4°C). Weather in February »Weather in March
March, the first month of the spring in Janesville, is a chilly month, with an average temperature varying between 45.1°F (7.3°C) and 28.2°F (-2.1°C). The average high-temperature is a frosty 45.1°F (7.3°C) in March, hardly different from the 40.3°F (4.6°C) recorded in February. Weather in March »Weather in April
April in Janesville, California, is a fresh spring month, with an average temperature ranging between min 32.7°F (0.4°C) and max 53.4°F (11.9°C). Janesville's transition into April is marked by a minor temperature shift, moving from a frosty 45.1°F (7.3°C) in March to a cool 53.4°F (11.9°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Janesville, California, with an average temperature fluctuating between 63°F (17.2°C) and 39.7°F (4.3°C). The arrival of May signals an increase in the average high-temperature, moving from a fresh 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 moderately hot month in Janesville, California, with temperature in the range of an average high of 73.9°F (23.3°C) and an average low of 46.6°F (8.1°C). The average high-temperature increases in June, moving from a comfortable 63°F (17.2°C) in May to a warm 73.9°F (23.3°C). Weather in June »Weather in July
July, like June, in Janesville, California, is another warm summer month, with temperature in the range of an average high of 84.6°F (29.2°C) and an average low of 52.7°F (11.5°C). In Janesville, the peak temperatures are generally noted in July, averaging a high of 84.6°F (29.2°C) and a low of 52.7°F (11.5°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Janesville, California, with an average temperature ranging between min 51.4°F (10.8°C) and max 83.5°F (28.6°C). August ushers in an average high-temperature of a still warm 83.5°F (28.6°C), aligning closely with the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Janesville, is still a warm month, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 46.4°F (8°C). September comes with a decrease in the average high-temperature, falling from 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 another mild autumn month, with temperature in the range of an average low of 37.6°F (3.1°C) and an average high of 60.1°F (15.6°C). The beginning of October involves a decrease in the average high-temperature, transitioning from a warm 74.3°F (23.5°C) in September to a refreshing 60.1°F (15.6°C). Weather in October »Weather in November
November, the last month of the autumn in Janesville, is another chilly month, with temperature in the range of an average low of 28.2°F (-2.1°C) and an average high of 47.3°F (8.5°C). November is characterized by a reduction in the average high-temperature, from a mild 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 temperature in the range of an average high of 36.9°F (2.7°C) and an average low of 22.6°F (-5.2°C). December tends to be the coldest month, with temperatures averaging a daily high of 36.9°F (2.7°C) and a low of 22.6°F (-5.2°C). Weather in December »Updated: Feb 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The most humid month in Janesville is January, with an average relative humidity of 81%.
In Janesville, California, during the entire year, the rain falls for 97.2 days and collects up to 13.98" (355mm) of precipitation.
January through June, September through December are months with snowfall.
In Janesville, during the entire year, snow falls for 52.5 days and aggregates up to 43.07" (1094mm) of snow.
The months with the least sunshine are January and December, with an average of 5.8h of sunshine.
February and November, with an average maximum UV index of 1, are months with the lowest UV index in Janesville.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
The month with the longest days is June, with an average of 15h and 0min of daylight.
June and July, with an average maximum UV index of 6, are months with the highest UV index.
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).
The months with the lowest humidity in Janesville, California, are July and August, with an average relative humidity of 35%.
The month with the least rainfall in Janesville is July, when the rain falls for 2.8 days and typically collects 0.12" (3mm) of precipitation.
July and August are months without snowfall in Janesville.
The month with the most sunshine in Janesville, California, is July, with an average of 12.1h of sunshine.
December tends to be the coldest month in Janesville, California, with temperatures averaging a daily high of 36.9°F (2.7°C) and a low of 22.6°F (-5.2°C).
The month with the most rainfall in Janesville, California, is December, when the rain falls for 10.8 days and typically aggregates up to 2.28" (58mm) of precipitation.
The month with the most snowfall in Janesville, California, is December, when snow falls for 11.4 days and typically aggregates up to 10.16" (258mm) of snow.
With an average of 9h and 24min of daylight, December has the shortest days of the year in Janesville.
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).
Average pressure
Janesville, CA
- Average pressure in January:
30.2"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.17"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Janesville, CA
- Average wind speed in January:
5.2mph - Average wind speed in February:
6.2mph - Average wind speed in March:
7mph - Average wind speed in April:
7.2mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.8mph - Average wind speed in September:
5.9mph - Average wind speed in October:
5.8mph - Average wind speed in November:
5.5mph - Average wind speed in December:
5.5mph
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).
Average humidity
Janesville, CA
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall
Janesville, CA
- Average rainfall in January:
2.01" - Average rainfall in February:
2.01" - Average rainfall in March:
2.2" - Average rainfall in April:
1.34" - Average rainfall in May:
1.38" - Average rainfall in June:
0.47"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.16" - Average rainfall in September:
0.31" - Average rainfall in October:
0.63" - Average rainfall in November:
1.06" - Average rainfall in December:
2.28"
The wettest month (with the highest rainfall) is December (2.28").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days
Janesville, CA
- Average rainfall days in January:
9.4 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
13.4 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
12.2 days - Average rainfall days in June:
5.6 days
- Average rainfall days in July:
2.8 days - Average rainfall days in August:
2.8 days - Average rainfall days in September:
4.5 days - Average rainfall days in October:
6.4 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
10.8 days
The month with the highest number of rainy days is March (13.4 days).
The months with the least rainy days are July and August (2.8 days).
Average snowfall
Janesville, CA
- Average snowfall in January:
8.03" - Average snowfall in February:
8.78" - Average snowfall in March:
9.41" - Average snowfall in April:
3.15" - Average snowfall in May:
0.31" - Average snowfall in June:
0.16"
The month with the highest snowfall is December (10.16").
The months with the least snowfall are July and August (0").
Average snowfall days
Janesville, CA
- Average snowfall days in January:
9.5 days - Average snowfall days in February:
9.3 days - Average snowfall days in March:
10.2 days - Average snowfall days in April:
5.5 days - Average snowfall days in May:
0.9 days - Average snowfall days in June:
0.2 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.2 days - Average snowfall days in October:
0.7 days - Average snowfall days in November:
4.6 days - Average snowfall days in December:
11.4 days
The month with the highest number of snowfall days is December (11.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Janesville, CA
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
5h and 48min - Average sunshine in February:
6h and 24min - Average sunshine in March:
8h and 12min - Average sunshine in April:
10h and 30min - Average sunshine in May:
11h and 18min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
11h and 54min - Average sunshine in September:
11h and 18min - Average sunshine in October:
7h and 24min - Average sunshine in November:
6h and 54min - Average sunshine in December:
5h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).
Average sunshine days
Janesville, CA
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
14.2 days - Average sunshine days in March:
12 days - Average sunshine days in April:
12.7 days - Average sunshine days in May:
15.9 days - Average sunshine days in June:
22.5 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
26.2 days - Average sunshine days in September:
24.7 days - Average sunshine days in October:
23.5 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
14.5 days
The month with the most sunshine days is August (26.2 days).
The month with the least sunshine days is March (12 days).
Average UV index
Janesville, CA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are February and November (UV index 1).
Average cloud cover
Janesville, CA
The month with the most cloud cover is December (Cloud cover 38).
The months with the least cloud cover are July and August (Cloud cover 7).
Average visibility
Janesville, CA
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
