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December Weather in Delavan, United States

Last updated: June 24, 2025

In Delavan, United States, the average temperature in December hovers around -1°C (30°F). Be prepared for temperature fluctuations, as it can dip to a chilly -22°C (-7°F) and peak at a mild 18°C (65°F). Expect about 50 mm (2.0 in) of precipitation over 6 days, accompanied by a high average humidity of 81%. Stay cozy and enjoy the unique winter atmosphere!

December Temperature in Delavan

In December in Delavan, the average temperature is -1°C (30°F), with maximums reaching 18°C (65°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Delavan: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Delavan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Delavan, December typically has an average temperature of -1°C (30°F), with highs reaching up to 18°C (65°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec222437465970757266523730
Data source: Temperature data for Delavan 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 Delavan

In Delavan in December, the precipitation amount is 50 mm (2.0 in) over the course of 6 days.

December Precipitation Trends in Delavan

The chart displays monthly precipitation patterns in Delavan, 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 Delavan, December typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec58546010513611082891051144650
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Delavan

In Delavan in December, humidity is 81%. With an average temperature of -1°C (30°F), this humidity feels like an extra layer of chill settles in, making travel uncomfortable and the cold air cling to your skin, dampening the experience with every breath.

December Average Humidity in Delavan

This chart illustrates the average monthly humidity levels in Delavan, 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 Delavan is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Delavan

In Delavan in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Delavan, you can visit Hourly UV Index in Delavan.

Maximum UV Index Levels in Delavan for December

The chart shows the monthly maximum UV Index (UVI) for Delavan 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 Delavan typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Delavan 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 Delavan Compares to Other Months

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

This table compares monthly weather conditions in Delavan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (22°F)58 mm (2.3 inches)85%moderate
February Weather-5°C (24°F)54 mm (2.1 inches)85%moderate
March Weather3°C (37°F)60 mm (2.4 inches)85%high
April Weather8°C (47°F)105 mm (4.1 inches)85%very high
May Weather15°C (60°F)136 mm (5.4 inches)78%very high
June Weather21°C (71°F)110 mm (4.3 inches)80%very high
July Weather24°C (75°F)82 mm (3.2 inches)78%very high
August Weather22°C (72°F)89 mm (3.5 inches)76%very high
September Weather19°C (66°F)105 mm (4.1 inches)79%very high
October Weather11°C (52°F)113 mm (4.5 inches)83%moderate
November Weather3°C (37°F)46 mm (1.8 inches)88%moderate
December Weather-1°C (30°F)50 mm (2.0 inches)81%low

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