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December Weather in Chester, United States

Last updated: June 24, 2025

In December, the average temperature in Chester, United States hovers around 5°C (41°F). While you might experience a minimum of -15°C (5°F), the maximum can reach a pleasant 24°C (75°F). Expect precipitation of 77 mm (3.0 in) spread over 7 days with an average humidity of 88%, making it a notably damp month.

December Temperature in Chester

In December in Chester, the average temperature is 5°C (41°F), with a maximum that can reach 24°C (75°F) and a minimum that can drop as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December temperature patterns in Chester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chester, December typically has an average temperature of 5°C (41°F), with highs reaching up to 24°C (75°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748566877807773604541
Data source: Temperature data for Chester 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 Chester

In Chester in December, the precipitation amount is 77 mm (3.0 in) over the course of 7 days.

December Precipitation Trends in Chester

The chart displays monthly precipitation patterns in Chester, 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 Chester, December typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec881081361441588788103641258477
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Chester

In Chester in December humidity is 88%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making it essential to bundle up for your travels, as every breath feels heavy in the air and the landscape appears cloaked in a misty shroud.

December Average Humidity in Chester

This chart illustrates the average monthly humidity levels in Chester, 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 Chester is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Chester

In Chester in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Chester, you can check the information here.

Maximum UV Index Levels in Chester for December

The chart shows the monthly maximum UV Index (UVI) for Chester 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 Chester typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111110109753
Data source: Chester 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 Chester Compares to Other Months

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

This table compares monthly weather conditions in Chester, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)88 mm (3.5 inches)86%moderate
February Weather3°C (38°F)108 mm (4.2 inches)84%moderate
March Weather9°C (48°F)136 mm (5.3 inches)84%high
April Weather13°C (56°F)144 mm (5.7 inches)80%very high
May Weather20°C (68°F)157 mm (6.2 inches)82%extreme
June Weather25°C (77°F)87 mm (3.4 inches)83%extreme
July Weather27°C (80°F)88 mm (3.5 inches)79%very high
August Weather25°C (77°F)103 mm (4.1 inches)76%very high
September Weather23°C (73°F)64 mm (2.5 inches)75%very high
October Weather16°C (60°F)125 mm (4.9 inches)74%high
November Weather7°C (45°F)84 mm (3.3 inches)85%moderate
December Weather5°C (41°F)77 mm (3.0 inches)88%moderate

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