Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
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). During January, Janesville experiences an average low-temperature of 23.2°F (-4.9°C) at night.Humidity
With an average relative humidity of 81%, January is the most humid month in Janesville.Rainfall
In Janesville, California, in January, during 9.4 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. Throughout the year, there are 97.2 rainfall days, and 13.98" (355mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. In Janesville, in January, snow falls for 9.5 days, with typically accumulated 8.03" (204mm) of snow. In Janesville, California, during the entire year, snow falls for 52.5 days and aggregates up to 43.07" (1094mm) of snow.Daylight
The average length of the day in January in Janesville is 9h and 41min.On the first day of January, sunrise is at 7:24 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:18 pm PST.
Sunshine
January and December, with an average of 5.8h of sunshine, are months with the least sunshine in Janesville, California.UV index
The average daily maximum UV index in January in Janesville is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during January leads to these advisories:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January in Janesville?
What is the most humid month in Janesville?
What is the average humidity in January in Janesville?
How many days does it rain in January in Janesville?
How much does it snow in Janesville in January?
How many hours of daylight does Janesville have in January?
When is the sunrise / sunset in January in Janesville?
What is the month with the least sunshine in Janesville?
How many hours of sunshine does Janesville have in January?
How high is the UV index in January in Janesville?
Average temperature in January
Janesville, CA
- Average high temperature in January: 38.1°F
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).
- Average low temperature in January: 23.2°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 in January
Janesville, CA
- Average pressure in January: 30.2"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 in January
Janesville, CA
- Average wind speed in January: 5.2mph
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 in January
Janesville, CA
- Average humidity in January: 81%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall in January
Janesville, CA
- Average rainfall in January: 2.01"
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 in January
Janesville, CA
- Average rainfall days in January: 9.4 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 in January
Janesville, CA
- Average snowfall in January: 8.03"
The month with the highest snowfall is December (10.16").
The months with the least snowfall are July and August (0").
Average snowfall days in January
Janesville, CA
- Average snowfall days in January: 9.5 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 in January /
Average sunshine in January
Janesville, CA
- Average daylight in January: 9h and 4min
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 5min
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 in January
Janesville, CA
- Average sunshine days in January: 15.8 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 in January
Janesville, CA
- Average UV index in January: 2
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 in January
Janesville, CA
- Average cloud cover in January: 37
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 in January
Janesville, CA
- Average visibility in January: 5mi
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).
Janesville, California, USA
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