December Weather in Combined Locks, United States

Last updated: June 24, 2025

In December, the average temperature in Combined Locks, United States hovers around -3°C (27°F). While you might experience chilly lows of -28°C (-17°F), it’s possible to enjoy the occasional warm day, reaching up to 17°C (64°F). Be prepared for about 51 mm (2.0 in) of precipitation spread over 7 days, and expect a relatively high average humidity of 87%.

December Temperature in Combined Locks

In December in Combined Locks, the average temperature is -3°C (27°F). The maximum can reach 17°C (64°F), while the minimum can drop as low as -28°C (-17°F). Travelers should be prepared for a wide range of temperatures and dress in layers to enjoy their visit comfortably.

December Weather in Combined Locks: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Combined Locks, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Combined Locks, December typically has an average temperature of -3°C (27°F), with highs reaching up to 17°C (64°F) and lows dropping to around -28°C (-17°F).
JanFebMarAprMayJunJulAugSepOctNovDec202133435769737063503527
Data source: Temperature data for Combined Locks 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 Combined Locks

In Combined Locks in December, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.

December Precipitation Trends in Combined Locks

The chart displays monthly precipitation patterns in Combined Locks, 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 Combined Locks, December typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec4248609610410310810571964951
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Combined Locks

In Combined Locks in December humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.

December Average Humidity in Combined Locks

This chart illustrates the average monthly humidity levels in Combined Locks, 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 Combined Locks is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Combined Locks

In Combined Locks 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 Combined Locks, you can visit Hourly UV Index in Combined Locks.

Maximum UV Index Levels in Combined Locks for December

The chart shows the monthly maximum UV Index (UVI) for Combined Locks 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 Combined Locks typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3457910997532
Data source: Combined Locks 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 Combined Locks Compares to Other Months

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

This table compares monthly weather conditions in Combined Locks, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (21°F)42 mm (1.7 inches)89%moderate
February Weather-6°C (21°F)48 mm (1.9 inches)90%moderate
March Weather1°C (34°F)60 mm (2.3 inches)87%moderate
April Weather6°C (43°F)96 mm (3.8 inches)84%high
May Weather14°C (57°F)104 mm (4.1 inches)77%very high
June Weather20°C (69°F)103 mm (4.1 inches)75%very high
July Weather23°C (73°F)108 mm (4.3 inches)74%very high
August Weather21°C (70°F)105 mm (4.1 inches)73%very high
September Weather17°C (63°F)71 mm (2.8 inches)78%high
October Weather10°C (50°F)96 mm (3.8 inches)84%moderate
November Weather2°C (35°F)49 mm (1.9 inches)89%moderate
December Weather-3°C (27°F)51 mm (2.0 inches)87%low

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