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December Weather in Chester, United States

Last updated: June 24, 2025

In December, the average temperature in Chester, United States is a chilly -5°C (24°F), with extremes ranging from a frigid -32°C (-25°F) to a mild 17°C (63°F). The region experiences about 20 mm (0.8 in) of precipitation over 5 days, coupled with an average humidity of 89%, making for a damp and crisp atmosphere.

December Temperature in Chester

In December in Chester, the average temperature is -5°C (24°F). Maximums can reach 17°C (63°F) and minimums can be as low as -32°C (-25°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both chilly days and milder conditions.

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 (24°F), with highs reaching up to 17°C (63°F) and lows dropping to around -32°C (-25°F).
JanFebMarAprMayJunJulAugSepOctNovDec211530415464726958423224
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 20 mm (0.8 in) over a period of 5 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 20 mm (0.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec133318375749102528202820
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 89%. With an average temperature of -5°C (24°F), this humidity feels like an uncomfortable chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm while battling the dampness in the air.

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 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%89%83%76%73%75%75%70%67%72%82%89%
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 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 Chester, you can visit Hourly UV Index in Chester.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789997532
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 Weather-6°C (21°F)13 mm (0.5 inches)86%low
February Weather-9°C (15°F)33 mm (1.3 inches)89%moderate
March Weather-1°C (30°F)18 mm (0.7 inches)83%moderate
April Weather5°C (41°F)37 mm (1.4 inches)75%high
May Weather12°C (54°F)57 mm (2.2 inches)72%very high
June Weather18°C (64°F)48 mm (1.9 inches)75%very high
July Weather22°C (72°F)10 mm (0.4 inches)75%very high
August Weather20°C (69°F)25 mm (1.0 inches)69%very high
September Weather14°C (58°F)28 mm (1.1 inches)66%high
October Weather6°C (42°F)20 mm (0.8 inches)72%moderate
November Weather0°C (32°F)28 mm (1.1 inches)82%moderate
December Weather-5°C (24°F)20 mm (0.8 inches)89%low

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