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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 -1°C (31°F). Be prepared for chillier nights, as temperatures can dip to a minimum of -14°C (7°F), while daytime highs may reach up to 13°C (56°F). Expect a precipitation amount of 171 mm (6.7 in) spread over approximately 12 days, contributing to an average humidity level of 86%.

December Temperature in Chester

In December in Chester, the average temperature is -1°C (31°F). The maximum can reach 13°C (56°F) and the minimum can be as low as -14°C (7°F). Be sure to pack warm clothing and prepare for a mix of chilly and mild days when traveling during this time.

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 -1°C (31°F), with highs reaching up to 13°C (56°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec323235415162716961483931
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 total precipitation amount is 171 mm (6.7 in) occurring over a span of 12 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 171 mm (6.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec21723219810075229172853106171
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 86%. With an average temperature of -1°C (31°F), this humidity feels like an eerie chill enveloping you, making travel uncomfortable as the damp air bites into your skin and the cold seeps through even the warmest of clothes, creating an atmosphere that is heavy and uninviting.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec45810121211119753
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 Weather0°C (32°F)217 mm (8.5 inches)86%moderate
February Weather0°C (32°F)232 mm (9.1 inches)87%moderate
March Weather2°C (35°F)198 mm (7.8 inches)86%very high
April Weather5°C (42°F)100 mm (3.9 inches)83%very high
May Weather11°C (52°F)75 mm (3.0 inches)72%extreme
June Weather17°C (63°F)22 mm (0.9 inches)67%extreme
July Weather22°C (71°F)9 mm (0.3 inches)56%extreme
August Weather21°C (69°F)16 mm (0.6 inches)42%extreme
September Weather16°C (61°F)27 mm (1.1 inches)46%very high
October Weather9°C (49°F)53 mm (2.1 inches)67%high
November Weather4°C (39°F)106 mm (4.2 inches)86%moderate
December Weather-1°C (31°F)171 mm (6.7 inches)86%moderate

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