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DeKalb (IL) Weather and Climate: A Comprehensive Guide

The climate in DeKalb is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to very cold in the cooler months. It receives a reasonable amount of rain/snowfall. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

In DeKalb, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 28°C in July. In January, the coolest month of the year, temperatures drop to a very cold -2°C.

At night, you can expect cooler temperatures, with averages dropping to around -11°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

On average, DeKalb receives a reasonable amount of rain/snowfall, with an annual precipitation of 985 mm. DeKalb can be quite wet during June, receiving approximately 127 mm of precipitation over 14 rainy days.

In contrast January, experiences much drier conditions, with 38 mm of snowfall, spread across 10 snowy days. For more details, please visit our DeKalb Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

DeKalb can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 3.6 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Chicago, the United States of America (70 KM, 43 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (70 KM, 43 Miles).

Forecast for DeKalb (IL)

Mon   Dec 23
3°C | -2°C
S 5 m/s
broken clouds and no rain

broken clouds and no rain

Tue   Dec 24
2°C | -2°C
NE 3 m/s
overcast and no rain

overcast and no rain

Wed   Dec 25
3°C | -2°C
E 3 m/s
overcast and no rain

overcast and no rain

The best time of year to visit DeKalb in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is winter in DeKalb?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in DeKalb?
    July has an average maximum temperature of 28°C and is the warmest month of the year.
  • Which is the coldest month in DeKalb?
    The coldest month is January with an average maximum temperature of -2°C.
  • Which is the wettest month in DeKalb?
    June tops the wettest month list with 127 mm of rainfall.
  • Which is the driest month in DeKalb?
    January is the driest month with 38 mm of precipitation.
  • Which is the sunniest month in DeKalb?
    July is the sunniest month with an average of 319 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.