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
In Jefferson, January is the month with the lowest recorded average temperatures, measuring a high of 24.3°F (-4.3°C) and a low of 12°F (-11.1°C).Humidity
January is the most humid month in Jefferson, with an average relative humidity of 88%.Rainfall
The months with the least rainfall are January and February Rain falls for 5.2 days and accumulates 1.42" (36mm) of rain.Snowfall
January through May, October through December are months with snowfall in Jefferson. In January, it is snowing for 15.4 days. Throughout January, 5.24" (133mm) of snow is accumulated. In Jefferson, during the entire year, snow falls for 58 days and aggregates up to 21.85" (555mm) of snow.Daylight
The average length of the day in January is 9h and 26min.On the first day of January, sunrise is at 7:26 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:05 pm CST.
Sunshine
January has the least sunshine of the year in Jefferson, with an average of 3.4h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 1 during January morphs into the following directions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Jefferson?
How cold is January in Jefferson?
What is the most humid month in Jefferson?
What is the average humidity in January in Jefferson?
What is the driest month in Jefferson?
How many days does it rain in January in Jefferson?
How many days does it snow in January in Jefferson?
What is the average length of the day in January in Jefferson?
When are sunrise and sunset in January in Jefferson?
What is the month with the least sunshine in Jefferson?
How many hours of sunshine does Jefferson have in January?
What is the month with the lowest UV index in Jefferson?
What is the UV index intensity in January in Jefferson?
Average temperature in January
Jefferson, 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°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°F).
Average pressure in January
Jefferson, WI
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Jefferson, 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 (6.4mph).
Average humidity in January
Jefferson, 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
Jefferson, WI
- Average rainfall in January: 1.42"
The wettest month (with the highest rainfall) is June (3.78").
The driest months (with the least rainfall) are January and February (1.42").
Average rainfall days in January
Jefferson, WI
- Average rainfall days in January: 5.2 days
The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is February (5 days).
Average snowfall in January
Jefferson, WI
- Average snowfall in January: 5.24"
The month with the highest snowfall is February (5.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Jefferson, WI
- Average snowfall days in January: 15.4 days
The month with the highest number of snowfall days is January (15.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Jefferson, 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 month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in January
Jefferson, WI
- Average sunshine days in January: 12.5 days
The month with the most sunshine days is November (16.1 days).
The months with the least sunshine days are May and June (9.8 days).
Average UV index in January
Jefferson, WI
- 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
Jefferson, 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
Jefferson, WI
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, October and November (6mi).
The months with the lowest visibility are January, February, July, August, September and December (5mi).
Jefferson, Wisconsin, USA
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