Climate Insights for De Kalb

The climate in De Kalb is warm and mild. The average annual temperature is 19°C and approximately 1389mm of precipitation falls per year. De Kalb receives a notable amount of rainfall throughout the year, including during its driest month. De Kalb is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to 3°C. Light snow can occur between January and February.

Temperatures in De Kalb vary considerably across the year, with a 31°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 34°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 3°C and an average of 7°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

De Kalb is a fairly wet location, receiving approximately 1389mm of precipitation annually, which averages out to around 116mm per month. The wettest month is April, averaging 197mm of rainfall. May and March also tend to see above-average precipitation. The driest month is September, with just 53mm. That's 144mm less than April, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Light snowfall can occur between January and February, totalling around 5cm annually. February is the snowiest month with approximately 3cm.

De Kalb is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 16km/h in winter, 17km/h in spring, 13km/h in summer, 14km/h in autumn.

It is currently spring in De Kalb, which began on March 20, 2026. De Kalb is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 34°C, while the coldest stretch bottoms out in January near 3°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The table below shows monthly climate averages for De Kalb based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.