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December Weather in Westfield, United States

Last updated: June 24, 2025

In December, the average temperature in Westfield, United States hovers around 1°C (33°F), with a minimum plunging to -15°C (5°F) and peaking at a comfortable 16°C (62°F). Expect 124 mm (4.9 in) of precipitation spread over 18 days, coupled with an average humidity of a moist 87%.

December Temperature in Westfield

In December in Westfield, the average temperature is 1°C (33°F). Maximums can reach 16°C (62°F) and minimums can be as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December temperature patterns in Westfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westfield, December typically has an average temperature of 1°C (33°F), with highs reaching up to 16°C (62°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec272835445766727064544033
Data source: Temperature data for Westfield 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 Westfield

In Westfield in December, the precipitation amount is 124 mm (4.9 in) over a span of 18 days.

December Precipitation Trends in Westfield

The chart displays monthly precipitation patterns in Westfield, 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 Westfield, December typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec10310410012612212915511187152129124
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Westfield

In Westfield in December, humidity is 87%. With an average temperature of 1°C (33°F), this humidity feels like a chilling blanket, making traveling uncomfortable as the cold air clings to your skin, amplifying the frosty bite and dampness that can quickly lead to a sense of unease.

December Average Humidity in Westfield

This chart illustrates the average monthly humidity levels in Westfield, 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 Westfield is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Westfield

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

Maximum UV Index Levels in Westfield for December

The chart shows the monthly maximum UV Index (UVI) for Westfield 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 Westfield typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101098642
Data source: Westfield 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 Westfield Compares to Other Months

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

This table compares monthly weather conditions in Westfield, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)103 mm (4.1 inches)91%low
February Weather-2°C (29°F)104 mm (4.1 inches)91%moderate
March Weather1°C (35°F)100 mm (3.9 inches)88%high
April Weather7°C (45°F)126 mm (4.9 inches)88%very high
May Weather14°C (57°F)122 mm (4.8 inches)82%very high
June Weather19°C (67°F)129 mm (5.1 inches)79%very high
July Weather22°C (72°F)155 mm (6.1 inches)77%very high
August Weather21°C (70°F)111 mm (4.4 inches)72%very high
September Weather18°C (64°F)87 mm (3.4 inches)76%very high
October Weather12°C (54°F)152 mm (6.0 inches)83%high
November Weather4°C (40°F)129 mm (5.1 inches)88%moderate
December Weather1°C (33°F)124 mm (4.9 inches)87%low

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