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
During the coldest month, January, temperatures average a high of 17.6°F (-8°C) and a low of 5.4°F (-14.8°C).Humidity
January and February, with an average relative humidity of 92%, are the most humid months in Sumner.Rainfall
January is the month with the least rainfall in Sumner. Rain falls for 3.8 days and accumulates 0.87" (22mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Sumner, in January, snow falls for 18.8 days, with typically accumulated 4.88" (124mm) of snow. In Sumner, during the entire year, snow falls for 84.2 days and aggregates up to 30.63" (778mm) of snow.Daylight
The average length of the day in January in Sumner is 9h and 12min.On the first day of the month, sunrise is at 7:46 am and sunset at 4:33 pm. On the last day of January, in Sumner, Wisconsin, sunrise is at 7:28 am and sunset at 5:11 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 2.8h of sunshine.UV index
January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 1 in January leads to these recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Sumner?
How cold is January in Sumner?
What are the most humid months in Sumner?
What is the average humidity in January in Sumner?
What is the driest month in Sumner?
How many days does it rain in January in Sumner?
How many days does it snow in January in Sumner?
How many hours of daylight does Sumner have in January?
What time are sunrise and sunset in January in Sumner?
What is the month with the least sunshine in Sumner?
How long on average sun shines in January in Sumner?
What is the month with the lowest UV index in Sumner?
What is the UV index intensity in January in Sumner?
Average temperature in January
Sumner, WI
- Average high temperature in January: 17.6°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in January: 5.4°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in January
Sumner, WI
- Average pressure in January: 30.12"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in January
Sumner, WI
- Average wind speed in January: 8.6mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in January
Sumner, WI
- Average humidity in January: 92%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (76%).
Average rainfall in January
Sumner, WI
- Average rainfall in January: 0.87"
The wettest month (with the highest rainfall) is June (3.82").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in January
Sumner, WI
- Average rainfall days in January: 3.8 days
The month with the highest number of rainy days is June (19 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in January
Sumner, WI
- Average snowfall in January: 4.88"
The month with the highest snowfall is February (6.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Sumner, WI
- Average snowfall days in January: 18.8 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Sumner, WI
- Average daylight in January: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January: 2h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in January
Sumner, WI
- Average sunshine days in January: 12.2 days
The month with the most sunshine days is October (15.9 days).
The month with the least sunshine days is June (9.4 days).
Average UV index in January
Sumner, WI
- Average UV index in January: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in January
Sumner, WI
- Average cloud cover in January: 72
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in January
Sumner, WI
- Average visibility in January: 4mi
The months with the highest visibility are April, May, June and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Sumner, Wisconsin, USA
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