nomadseason

December Weather in Westerly, United States

Last updated: June 24, 2025

In December, the average temperature in Westerly, United States hovers around 3°C (37°F), though it can dip as low as -14°C (6°F) or climb to a maximum of 17°C (63°F). Expect about 125 mm (4.9 in) of precipitation over 10 days, with an average humidity of 80%, making it a rather chilly and possibly wet time of year.

December Temperature in Westerly

In December in Westerly, the average temperature is 3°C (37°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -14°C (6°F). Be sure to pack warm clothing if you're planning to visit during this time.

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

The chart illustrates December temperature patterns in Westerly, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westerly, December typically has an average temperature of 3°C (37°F), with highs reaching up to 17°C (63°F) and lows dropping to around -14°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec333539485867747367584537
Data source: Temperature data for Westerly generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Westerly

In Westerly in December, the precipitation amount is 125 mm (4.9 in) spread over a period of 10 days.

December Precipitation Trends in Westerly

The chart displays monthly precipitation patterns in Westerly, 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 Westerly, December typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec73951011251119512810293134100125
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Westerly

In Westerly in December, humidity is 80%. With an average temperature of 3°C (37°F), this humidity feels like a damp blanket wrapping around you, making outdoor adventures less enjoyable and prompting you to seek cozy indoor activities instead.

December Average Humidity in Westerly

This chart illustrates the average monthly humidity levels in Westerly, 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 Westerly is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Westerly

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

Maximum UV Index Levels in Westerly for December

The chart shows the monthly maximum UV Index (UVI) for Westerly 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 Westerly typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Westerly 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 Westerly Compares to Other Months

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

This table compares monthly weather conditions in Westerly, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)73 mm (2.9 inches)84%moderate
February Weather2°C (35°F)95 mm (3.7 inches)84%moderate
March Weather4°C (39°F)101 mm (4.0 inches)82%high
April Weather9°C (48°F)125 mm (4.9 inches)79%very high
May Weather14°C (58°F)111 mm (4.4 inches)75%very high
June Weather20°C (68°F)95 mm (3.7 inches)78%very high
July Weather23°C (74°F)128 mm (5.0 inches)76%very high
August Weather23°C (74°F)102 mm (4.0 inches)76%very high
September Weather19°C (67°F)93 mm (3.7 inches)75%very high
October Weather14°C (58°F)134 mm (5.3 inches)75%high
November Weather7°C (46°F)100 mm (3.9 inches)80%moderate
December Weather3°C (37°F)125 mm (4.9 inches)80%low

Compare Westerly's Climate with Cities Worldwide