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December Weather in Vernon Hills, United States

Last updated: June 24, 2025

In December, the average temperature in Vernon Hills, United States hovers around 1°C (33°F), with a minimum dipping to -19°C (-2°F) and a maximum reaching 18°C (64°F). Expect about 59 mm (2.3 in) of precipitation spread over 7 days, accompanied by a high average humidity of 81%. 🌧️

December Temperature in Vernon Hills

In December in Vernon Hills, the average temperature is 1°C (33°F). Maximums can reach 18°C (64°F), while minimums can drop as low as -19°C (-2°F). Be prepared for a significant temperature range when traveling during this time.

December Weather in Vernon Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Vernon Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vernon Hills, December typically has an average temperature of 1°C (33°F), with highs reaching up to 18°C (64°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec262737455668747267543933
Data source: Temperature data for Vernon Hills 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 Vernon Hills

In Vernon Hills in December, the precipitation amount is 59 mm (2.3 in) over a span of 7 days.

December Precipitation Trends in Vernon Hills

The chart displays monthly precipitation patterns in Vernon Hills, 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 Vernon Hills, December typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6867761181641098483851335859
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Vernon Hills

In Vernon Hills in December humidity is 81%. With an average temperature of 1°C (33°F), this humidity feels like a biting chill that clings to your skin, making every step outside feel damp and uncomfortable for traveling.

December Average Humidity in Vernon Hills

This chart illustrates the average monthly humidity levels in Vernon Hills, 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 Vernon Hills 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 Vernon Hills

In Vernon Hills 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 Vernon Hills, you can visit Hourly UV Index in Vernon Hills.

Maximum UV Index Levels in Vernon Hills for December

The chart shows the monthly maximum UV Index (UVI) for Vernon Hills 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 Vernon Hills typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101098532
Data source: Vernon Hills 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 Vernon Hills Compares to Other Months

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

This table compares monthly weather conditions in Vernon Hills, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)68 mm (2.7 inches)85%low
February Weather-3°C (28°F)67 mm (2.6 inches)85%moderate
March Weather3°C (38°F)76 mm (3.0 inches)85%high
April Weather7°C (46°F)118 mm (4.6 inches)85%very high
May Weather14°C (57°F)164 mm (6.5 inches)78%very high
June Weather20°C (68°F)109 mm (4.3 inches)80%very high
July Weather23°C (74°F)84 mm (3.3 inches)78%very high
August Weather22°C (73°F)83 mm (3.3 inches)76%very high
September Weather19°C (67°F)85 mm (3.3 inches)79%very high
October Weather12°C (54°F)133 mm (5.2 inches)83%moderate
November Weather4°C (40°F)58 mm (2.3 inches)88%moderate
December Weather1°C (33°F)59 mm (2.3 inches)81%low

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