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December Weather in Trumbull, United States

Last updated: June 24, 2025

In Trumbull, United States, the average temperature in December hovers around 3°C (37°F), with a minimum that can plunge to -13°C (10°F) and a maximum reaching up to 16°C (61°F). Expect 135 mm (5.3 in) of precipitation spread over 11 days, contributing to an average humidity of 80%. Prepare for a chilly and wet climate!

December Temperature in Trumbull

In December in Trumbull, the average temperature is 3°C (37°F), with maximums reaching up to 16°C (61°F) and minimums dropping as low as -13°C (10°F). Travelers should be prepared for chilly weather and pack layers to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Trumbull, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trumbull, December typically has an average temperature of 3°C (37°F), with highs reaching up to 16°C (61°F) and lows dropping to around -13°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec323539495969757468594537
Data source: Temperature data for Trumbull 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 Trumbull

In Trumbull in December, the precipitation amount is 135 mm (5.3 in) over the course of 11 days.

December Precipitation Trends in Trumbull

The chart displays monthly precipitation patterns in Trumbull, 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 Trumbull, December typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec771149913511995132102105152101135
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Trumbull

In Trumbull in December, humidity is 80%. With an average temperature of 3°C (37°F), this humidity feels like a damp blanket wrapping around you, making outdoor adventures less enjoyable and prompting you to seek cozy indoor activities instead.

December Average Humidity in Trumbull

This chart illustrates the average monthly humidity levels in Trumbull, 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 Trumbull is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trumbull

In Trumbull 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 Trumbull, you can visit Hourly UV Index in Trumbull.

Maximum UV Index Levels in Trumbull for December

The chart shows the monthly maximum UV Index (UVI) for Trumbull 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 Trumbull typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Trumbull 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 Trumbull Compares to Other Months

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

This table compares monthly weather conditions in Trumbull, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)77 mm (3.0 inches)84%moderate
February Weather1°C (35°F)114 mm (4.5 inches)82%moderate
March Weather4°C (40°F)99 mm (3.9 inches)81%high
April Weather9°C (49°F)135 mm (5.3 inches)78%very high
May Weather15°C (59°F)119 mm (4.7 inches)69%very high
June Weather20°C (69°F)95 mm (3.7 inches)69%very high
July Weather24°C (76°F)132 mm (5.2 inches)62%very high
August Weather23°C (74°F)102 mm (4.0 inches)65%very high
September Weather20°C (68°F)105 mm (4.1 inches)68%very high
October Weather15°C (59°F)152 mm (6.0 inches)74%high
November Weather7°C (46°F)100 mm (4.0 inches)82%moderate
December Weather3°C (37°F)135 mm (5.3 inches)80%low

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