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December Weather in De Kalb, United States

Last updated: June 24, 2025

In December, the average temperature in De Kalb, United States hovers around 10°C (50°F). Expect a minimum of -4°C (25°F) and a pleasant maximum of 27°C (81°F). Be prepared for some wet days, as the area sees an average precipitation of 127 mm (5.0 in) over 8 days, with humidity levels reaching a high 88%.

December Temperature in De Kalb

In December in De Kalb, the average temperature is 10°C (50°F). Maximums can reach 27°C (81°F) and minimums can be as low as -4°C (25°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

December Weather in De Kalb: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in De Kalb, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In De Kalb, December typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (81°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec464858637380838278675450
Data source: Temperature data for De Kalb generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in De Kalb

In De Kalb in December, the precipitation amount is 127 mm (5.0 in) spread over 8 days.

December Precipitation Trends in De Kalb

The chart displays monthly precipitation patterns in De Kalb, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In De Kalb, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10415113421717210577938012068127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in De Kalb

In De Kalb in December, humidity is 88%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and encouraging travelers to seek cozy indoor activities instead.

December Average Humidity in De Kalb

This chart illustrates the average monthly humidity levels in De Kalb, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in De Kalb is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in De Kalb

In De Kalb in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in De Kalb for better planning.

Maximum UV Index Levels in De Kalb for December

The chart shows the monthly maximum UV Index (UVI) for De Kalb in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in De Kalb typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: De Kalb December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in De Kalb Compares to Other Months

Weather in De Kalb varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in De Kalb, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in De Kalb, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)104 mm (4.1 inches)82%moderate
February Weather9°C (49°F)151 mm (6.0 inches)80%high
March Weather15°C (59°F)134 mm (5.3 inches)78%very high
April Weather17°C (63°F)217 mm (8.5 inches)79%very high
May Weather23°C (73°F)172 mm (6.8 inches)81%extreme
June Weather27°C (80°F)105 mm (4.1 inches)77%extreme
July Weather28°C (83°F)77 mm (3.0 inches)72%extreme
August Weather28°C (83°F)93 mm (3.7 inches)65%extreme
September Weather26°C (78°F)80 mm (3.1 inches)63%very high
October Weather19°C (67°F)120 mm (4.7 inches)70%very high
November Weather13°C (55°F)68 mm (2.7 inches)82%high
December Weather10°C (50°F)127 mm (5.0 inches)88%moderate

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