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
January is the month when Sullivan sees the lowest average temperatures, with a high of 24.3°F (-4.3°C) and a low of 12.2°F (-11°C).Humidity
With an average relative humidity of 88%, January is the most humid month.Rainfall
In Sullivan, in January, it is raining for 2.8 days, with typically 0.63" (16mm) of accumulated precipitation. In Sullivan, during the entire year, the rain falls for 121.6 days and collects up to 14.06" (357mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. January is the month with the most snowfall in Sullivan. Snow falls for 12.8 days and accumulates 2.13" (54mm) of snow.Daylight
In Sullivan, Wisconsin, the average length of the day in January is 9h and 26min.On the first day of the month, sunrise is at 7:25 am and sunset at 4:30 pm. On the last day of January, sunrise is at 7:10 am and sunset at 5:04 pm CST.
Sunshine
With an average of 3.4h of sunshine, January has the least sunshine of the year in Sullivan, Wisconsin.UV index
The months with the lowest UV index in Sullivan are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In January, the maximum UV index of 1 suggests this advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Sullivan?
How cold is January in Sullivan?
What is the most humid month in Sullivan?
What is the average humidity in January in Sullivan?
How many days does it rain in January in Sullivan?
What is the snowiest month in Sullivan?
How many days does it snow in January in Sullivan?
How many hours of daylight does Sullivan have in January?
When is the sunrise / sunset in January in Sullivan?
What is the month with the least sunshine in Sullivan?
How many hours of sunshine does Sullivan have in January?
What are the months with the lowest UV index in Sullivan?
What is the UV index reading in January in Sullivan?
Average temperature in January
Sullivan, WI
- Average high temperature in January: 24.3°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in January: 12.2°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in January
Sullivan, WI
- Average pressure in January: 30.1"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Sullivan, WI
- Average wind speed in January: 9.6mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in January
Sullivan, WI
- Average humidity in January: 88%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in January
Sullivan, WI
- Average rainfall in January: 0.63"
The wettest month (with the highest rainfall) is July (1.93").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in January
Sullivan, WI
- Average rainfall days in January: 2.8 days
The months with the highest number of rainy days are May and July (15.7 days).
The month with the least rainy days is January (2.8 days).
Average snowfall in January
Sullivan, WI
- Average snowfall in January: 2.13"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Sullivan, WI
- Average snowfall days in January: 12.8 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Sullivan, WI
- Average daylight in January: 9h and 2min
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 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in January
Sullivan, WI
- Average sunshine days in January: 16.8 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in January
Sullivan, WI
- Average UV index in January: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in January
Sullivan, WI
- Average cloud cover in January: 65
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in January
Sullivan, WI
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Sullivan, Wisconsin, USA
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