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
Mattoon reaches its lowest average temperatures in January, measuring 22.3°F (-5.4°C) at the peak and 11.5°F (-11.4°C) at the lowest.Humidity
The months with the highest humidity are January and February, with an average relative humidity of 88%.Rainfall
The months with the least rainfall are January and February Rain falls for 4.3 days and accumulates 1.02" (26mm) of rain.Snowfall
January through May, October through December are months with snowfall. January is the month with the most snowfall in Mattoon. Snow falls for 15.1 days and accumulates 5.28" (134mm) of snow.Daylight
In January, the average length of the day in Mattoon is 9h and 14min.On the first day of the month, sunrise is at 7:34 am and sunset at 4:24 pm. On the last day of January, sunrise is at 7:17 am and sunset at 5:01 pm CST.
Sunshine
In January, the average sunshine is 3.6h.UV index
The months with the lowest UV index in Mattoon are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In January, a regular UV index of 1 translates into these guidelines:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Enhance your sun protection with tightly woven, yet airy clothing. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What month is the coldest in Mattoon?
How cold is January in Mattoon?
What are the most humid months in Mattoon?
What is the average humidity in January in Mattoon?
What is the driest month in Mattoon?
How much does it rain in Mattoon in January?
When does it snow the most in Mattoon?
How many days does it snow in January in Mattoon?
What is the average length of the day in January in Mattoon?
When is the sunrise / sunset in January in Mattoon?
How many hours of sunshine does Mattoon have in January?
What are the months with the lowest UV index in Mattoon?
How high is the UV index in January in Mattoon?
Average temperature in January
Mattoon, WI
- Average high temperature in January: 22.3°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 (22.3°F).
- Average low temperature in January: 11.5°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (11.5°F).
Average pressure in January
Mattoon, WI
- Average pressure in January: 30.08"Hg
The months with the highest atmospheric pressure are February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Mattoon, WI
- Average wind speed in January: 8.6mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in January
Mattoon, WI
- Average humidity in January: 88%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are April and May (75%).
Average rainfall in January
Mattoon, WI
- Average rainfall in January: 1.02"
The wettest month (with the highest rainfall) is May (3.19").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in January
Mattoon, WI
- Average rainfall days in January: 4.3 days
The month with the highest number of rainy days is May (15.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in January
Mattoon, WI
- Average snowfall in January: 5.28"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Mattoon, WI
- Average snowfall days in January: 15.1 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Mattoon, 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: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in January
Mattoon, WI
- Average sunshine days in January: 15.5 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in January
Mattoon, WI
- Average UV index in January: 1
The months with the highest UV index are 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
Mattoon, WI
- Average cloud cover in January: 63
The months with the most cloud cover are January and February (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in January
Mattoon, WI
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, February, August and September (5mi).
Mattoon, Wisconsin, USA
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