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December Weather in Cosmopolis, United States

Last updated: June 24, 2025

In Cosmopolis, United States, the average temperature in December is a brisk 6°C (43°F). Expect chilly conditions, with minimums reaching -4°C (25°F) and maximums peaking at 14°C (57°F). This month also sees considerable precipitation, averaging 236 mm (9.3 in) over 19 days, and a high humidity level of 87%. Be prepared for a mix of cool weather and frequent showers!

December Temperature in Cosmopolis

In December in Cosmopolis, the average temperature is 6°C (43°F). The maximum can reach 14°C (57°F) and the minimum can be as low as -4°C (25°F). Be sure to pack layered clothing to stay comfortable in the fluctuating temperatures while exploring.

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

The chart illustrates December temperature patterns in Cosmopolis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cosmopolis, December typically has an average temperature of 6°C (43°F), with highs reaching up to 14°C (57°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec434145495559626360524742
Data source: Temperature data for Cosmopolis 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 Cosmopolis

In Cosmopolis in December, the precipitation amount is 236 mm (9.3 in) during 19 days, indicating a significant amount of rainfall throughout the month.

December Precipitation Trends in Cosmopolis

The chart displays monthly precipitation patterns in Cosmopolis, 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 Cosmopolis, December typically receives around 236 mm (9.3 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec25517415013264541213101170261236
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cosmopolis

In Cosmopolis in December, humidity is 87%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating warm, breathable layers for traveling.

December Average Humidity in Cosmopolis

This chart illustrates the average monthly humidity levels in Cosmopolis, 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 Cosmopolis is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Cosmopolis

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

Maximum UV Index Levels in Cosmopolis for December

The chart shows the monthly maximum UV Index (UVI) for Cosmopolis 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 Cosmopolis typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235699987532
Data source: Cosmopolis 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 Cosmopolis Compares to Other Months

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

This table compares monthly weather conditions in Cosmopolis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)255 mm (10.0 inches)86%low
February Weather5°C (42°F)174 mm (6.8 inches)84%moderate
March Weather7°C (45°F)150 mm (5.9 inches)85%moderate
April Weather10°C (50°F)132 mm (5.2 inches)83%high
May Weather13°C (55°F)64 mm (2.5 inches)84%very high
June Weather15°C (59°F)54 mm (2.1 inches)84%very high
July Weather16°C (62°F)12 mm (0.5 inches)82%very high
August Weather17°C (63°F)13 mm (0.5 inches)73%very high
September Weather15°C (60°F)101 mm (4.0 inches)74%high
October Weather11°C (52°F)170 mm (6.7 inches)83%moderate
November Weather8°C (47°F)261 mm (10.3 inches)86%moderate
December Weather6°C (43°F)236 mm (9.3 inches)87%low

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