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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 -7°C (20°F), with extremes that can plunge to a frigid -25°C (-12°F) or rise to a mild 14°C (58°F). Expect about 103 mm (4.1 in) of precipitation spread over 10 days, alongside notable humidity levels at 90%, creating a chilly yet intriguing atmosphere.

December Temperature in Westfield

In December in Westfield, the average temperature is -7°C (20°F). Maximums can reach 14°C (58°F) while minimums can drop as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures and ensure they dress in layers to stay comfortable during their visit.

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 -7°C (20°F), with highs reaching up to 14°C (58°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec151725385161676557463220
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 103 mm (4.1 in) over a span of 10 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 103 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec937976111108911179097112114103
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 90%. With an average temperature of -7°C (20°F), this humidity feels like an oppressive chill that seeps into your bones, making travel uncomfortable and your breath visible in the frosty air.

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 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%87%82%77%82%83%85%87%88%90%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887532
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-9°C (16°F)93 mm (3.7 inches)93%low
February Weather-8°C (18°F)79 mm (3.1 inches)92%moderate
March Weather-4°C (26°F)76 mm (3.0 inches)90%moderate
April Weather3°C (39°F)111 mm (4.4 inches)87%high
May Weather11°C (52°F)108 mm (4.2 inches)82%very high
June Weather16°C (61°F)91 mm (3.6 inches)77%very high
July Weather19°C (67°F)117 mm (4.6 inches)81%very high
August Weather19°C (66°F)90 mm (3.5 inches)83%very high
September Weather14°C (57°F)97 mm (3.8 inches)85%high
October Weather8°C (46°F)112 mm (4.4 inches)87%moderate
November Weather0°C (32°F)113 mm (4.5 inches)87%moderate
December Weather-7°C (20°F)103 mm (4.1 inches)90%low

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