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December Weather in Cornish, United States

Last updated: June 24, 2025

In December, the average temperature in Cornish, United States hovers around -2°C (28°F). Stargazers should prepare for a chill, as temperatures can dip as low as -25°C (-13°F), while the warmth may peak at a cozy 15°C (60°F). Expect about 114 mm (4.5 in) of precipitation spread over 10 days, contributing to a significant average humidity of 81%.

December Temperature in Cornish

In December in Cornish, the average temperature is -2°C (28°F), with maximums reaching 15°C (60°F) and minimums dropping as low as -25°C (-13°F). It's advisable to pack warm clothing and be prepared for significant temperature fluctuations when traveling during this month.

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

The chart illustrates December temperature patterns in Cornish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornish, December typically has an average temperature of -2°C (28°F), with highs reaching up to 15°C (60°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec242633455666727164523828
Data source: Temperature data for Cornish 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 Cornish

In Cornish in December, the precipitation amount is 114 mm (4.5 in) over a period of 10 days.

December Precipitation Trends in Cornish

The chart displays monthly precipitation patterns in Cornish, 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 Cornish, December typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec79897712374871468264121107114
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cornish

In Cornish in December, humidity is 81%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm and dry.

December Average Humidity in Cornish

This chart illustrates the average monthly humidity levels in Cornish, 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 Cornish is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Cornish

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

Maximum UV Index Levels in Cornish for December

The chart shows the monthly maximum UV Index (UVI) for Cornish 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 Cornish typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Cornish 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 Cornish Compares to Other Months

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

This table compares monthly weather conditions in Cornish, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)79 mm (3.1 inches)86%low
February Weather-3°C (26°F)89 mm (3.5 inches)84%moderate
March Weather0°C (33°F)77 mm (3.0 inches)82%moderate
April Weather7°C (45°F)123 mm (4.8 inches)80%very high
May Weather13°C (56°F)74 mm (2.9 inches)72%very high
June Weather19°C (67°F)87 mm (3.4 inches)72%very high
July Weather22°C (72°F)145 mm (5.7 inches)67%very high
August Weather22°C (71°F)82 mm (3.2 inches)66%very high
September Weather18°C (64°F)64 mm (2.5 inches)71%high
October Weather11°C (52°F)121 mm (4.8 inches)78%moderate
November Weather3°C (39°F)107 mm (4.2 inches)84%moderate
December Weather-2°C (28°F)114 mm (4.5 inches)81%low

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