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 DeKalb, January is the month with the lowest recorded average temperatures, measuring a high of 27°F (-2.8°C) and a low of 15.1°F (-9.4°C).Humidity
January and July, with an average relative humidity of 85%, are the most humid months.Rainfall
In January, the rain falls for 5.7 days. Throughout January, 1.81" (46mm) of precipitation is accumulated. In DeKalb, Illinois, during the entire year, the rain falls for 152.6 days and collects up to 32.09" (815mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is January, when snow falls for 11.8 days and typically aggregates up to 5.55" (141mm) of snow.Daylight
In DeKalb, the average length of the day in January is 9h and 32min.On the first day of the month, sunrise is at 7:22 am and sunset at 4:34 pm. On the last day of January, sunrise is at 7:08 am and sunset at 5:08 pm CST.
Sunshine
The month with the least sunshine in DeKalb is January, with an average of 3.6h of sunshine.UV index
January 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 hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 1 in January, converts into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be alert to the fact! The reflection from snow can nearly double the UV radiation of 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?
How cold is January?
What are the most humid months?
What is the average humidity in January?
How many days does it rain in January?
What is the snowiest month?
How many days does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does DeKalb have in January?
When is the lowest UV index?
What is the UV index reading in January?
Average temperature in January
DeKalb, IL
- Average high temperature in January: 27°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in January: 15.1°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in January
DeKalb, IL
- 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 (29.92"Hg).
Average wind speed in January
DeKalb, IL
- Average wind speed in January: 9.9mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in January
DeKalb, IL
- Average humidity in January: 85%
The months with the highest relative humidity are January and July (85%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in January
DeKalb, IL
- Average rainfall in January: 1.81"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days in January
DeKalb, IL
- Average rainfall days in January: 5.7 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.7 days).
Average snowfall in January
DeKalb, IL
- Average snowfall in January: 5.55"
The month with the highest snowfall is January (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
DeKalb, IL
- Average snowfall days in January: 11.8 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
DeKalb, IL
- Average daylight in January: 9h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 3h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in January
DeKalb, IL
- Average sunshine days in January: 14.6 days
The month with the most sunshine days is November (17.2 days).
The months with the least sunshine days are June and July (10.3 days).
Average UV index in January
DeKalb, IL
- Average UV index in January: 1
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
DeKalb, IL
- Average cloud cover in January: 63
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility in January
DeKalb, IL
- 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).
DeKalb, Illinois, USA
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