nomadseason

December Weather in Watertown, United States

Last updated: June 24, 2025

In December, the average temperature in Watertown, United States is a comfortable 14°C (58°F), with a minimum reaching as low as -3°C (27°F) and a maximum soaring to 28°C (83°F). Expect about 103 mm (4.1 in) of precipitation over 7 days, contributing to an average humidity of 88%.

December Temperature in Watertown

In December in Watertown, the average temperature is 14°C (58°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as -3°C (27°F). It's advisable to pack layers to accommodate the varying temperatures during your travel.

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

The chart illustrates December temperature patterns in Watertown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Watertown, December typically has an average temperature of 14°C (58°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec556164697679818179746258
Data source: Temperature data for Watertown 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 Watertown

In Watertown in December, the precipitation amount is 103 mm (4.1 in) over a span of 7 days.

December Precipitation Trends in Watertown

The chart displays monthly precipitation patterns in Watertown, 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 Watertown, December typically receives around 103 mm (4.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec54733675761581751841406564103
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Watertown

In Watertown in December humidity is 88%. With an average temperature of 14°C (58°F), this humidity feels like a warm, damp embrace, making travel a bit uncomfortable as you may find yourself constantly sticky and in need of refreshing breaks.

December Average Humidity in Watertown

This chart illustrates the average monthly humidity levels in Watertown, 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 Watertown is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Watertown

In Watertown in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Watertown.

Maximum UV Index Levels in Watertown for December

The chart shows the monthly maximum UV Index (UVI) for Watertown 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 Watertown typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579101111111110865
Data source: Watertown 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 Watertown Compares to Other Months

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

This table compares monthly weather conditions in Watertown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (55°F)54 mm (2.1 inches)85%moderate
February Weather16°C (61°F)73 mm (2.9 inches)82%high
March Weather18°C (65°F)36 mm (1.4 inches)80%very high
April Weather21°C (70°F)75 mm (3.0 inches)76%very high
May Weather24°C (76°F)76 mm (3.0 inches)73%extreme
June Weather26°C (80°F)158 mm (6.2 inches)74%extreme
July Weather27°C (81°F)175 mm (6.9 inches)80%extreme
August Weather27°C (81°F)184 mm (7.2 inches)79%extreme
September Weather26°C (80°F)140 mm (5.5 inches)83%very high
October Weather23°C (74°F)65 mm (2.6 inches)77%very high
November Weather17°C (62°F)64 mm (2.5 inches)84%high
December Weather14°C (58°F)103 mm (4.1 inches)88%moderate

Compare Watertown's Climate with Cities Worldwide