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
Janesville's January weather, with an average high temperature of 23.9°F (-4.5°C) and an average low temperature of 11.3°F (-11.5°C), tends to be the coldest of the year.Humidity
With an average relative humidity of 87%, January is the most humid month in Janesville.Rainfall
January is the month with the least rainfall in Janesville. Rain falls for 4.2 days and accumulates 1.02" (26mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Janesville, Iowa, in January, snow falls for 10.5 days, with typically accumulated 4.33" (110mm) of snow. Throughout the year, in Janesville, there are 43.6 snowfall days, and 19.25" (489mm) of snow is accumulated.Daylight
The average length of the day in January in Janesville is 9h and 29min.On the first day of the month, sunrise is at 7:39 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:25 am and sunset at 5:21 pm CST.
Sunshine
With an average of 3.8h of sunshine, January has the least sunshine of the year in Janesville, Iowa.UV index
The months with the lowest UV index in Janesville are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A daily maximum UV index of 1 in January translates into the following instructions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
What month is the coldest in Janesville?
How cold is it in Janesville in January?
What is the most humid month in Janesville?
What is the average humidity in January in Janesville?
What is the driest month in Janesville?
How much does it rain in Janesville in January?
How many days does it snow in January in Janesville?
What is the average length of the day in January in Janesville?
What time are sunrise and 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?
What is the month with the lowest UV index in Janesville?
How high is the UV index in January in Janesville?
Average temperature in January
Janesville, IA
- Average high temperature in January: 23.9°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (23.9°F).
- Average low temperature in January: 11.3°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).
Average pressure in January
Janesville, IA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in January
Janesville, IA
- Average wind speed in January: 10.5mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in January
Janesville, IA
- Average humidity in January: 87%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in January
Janesville, IA
- Average rainfall in January: 1.02"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in January
Janesville, IA
- Average rainfall days in January: 4.2 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in January
Janesville, IA
- Average snowfall in January: 4.33"
The month with the highest snowfall is February (5.08").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Janesville, IA
- Average snowfall days in January: 10.5 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Janesville, IA
- Average daylight in January: 9h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January: 3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in January
Janesville, IA
- Average sunshine days in January: 17.2 days
The months with the most sunshine days are October and November (17.8 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in January
Janesville, IA
- Average UV index in January: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Janesville, IA
- Average cloud cover in January: 61
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in January
Janesville, IA
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Janesville, Iowa, USA
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