January weather forecastHarrisburg, IL
January
Weather in January
January features the coldest temperatures amidst the year in Harrisburg, Illinois with temperatures fluctuating from 26.2°F (-3.2°C) to 39.7°F (4.3°C). As one could expect, this is the beginning of the Winter season, boasting a wintry tableau of frosty mornings and chilly nights. Snowfall is quite commonplace during this time, altering the landscape into an exquisite blanket of white. It's an ideal time for those who relish cold weather. The weather starts to slightly warm up as the month concludes.Temperature
With average high and low temperatures of 39.7°F (4.3°C) and 26.2°F (-3.2°C) respectively, January is Harrisburg's coldest month.Humidity
The average relative humidity in January is 77%.Rainfall
In Harrisburg, during January, the rain falls for 9.8 days and regularly aggregates up to 2.68" (68mm) of precipitation. Throughout the year, there are 158.6 rainfall days, and 36.02" (915mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. January is the month with the most snowfall. Snow falls for 5.3 days and accumulates 1.73" (44mm) of snow.Daylight
The average length of the day in January is 9h and 55min.On the first day of January, sunrise is at 7:09 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 5:16 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 4.6h of sunshine.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 2 in January translates into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Harrisburg, IL
- Average high temperature in January: 39.7°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in January: 26.2°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in January
Harrisburg, IL
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Harrisburg, IL
- Average wind speed in January: 9.4mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in January
Harrisburg, IL
- Average humidity in January: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in January
Harrisburg, IL
- Average rainfall in January: 2.68"
The wettest month (with the highest rainfall) is April (4.8").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in January
Harrisburg, IL
- Average rainfall days in January: 9.8 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in January
Harrisburg, IL
- Average snowfall in January: 1.73"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Harrisburg, IL
- Average snowfall days in January: 5.3 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Harrisburg, IL
- Average daylight in January: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 4h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in January
Harrisburg, IL
- Average sunshine days in January: 16.2 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in January
Harrisburg, IL
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in January
Harrisburg, IL
- Average cloud cover in January: 51
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in January
Harrisburg, IL
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
