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December Weather in Cornell, United States

Last updated: June 24, 2025

In December, the average temperature in Cornell, United States hovers around -5°C (23°F), subject to fluctuations from a chilly minimum of -32°C (-25°F) to a mild maximum of 15°C (59°F). Expect 60 mm (2.4 in) of precipitation spread over approximately 8 days, with an average humidity level of 85%. Be prepared for varying conditions as winter unfolds!

December Temperature in Cornell

In December in Cornell, the average temperature is -5°C (23°F), with maximums reaching 15°C (59°F) and minimums plummeting to as low as -32°C (-25°F). Be prepared for a wide range of temperatures when planning your travel to Cornell during this month.

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

The chart illustrates December temperature patterns in Cornell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornell, December typically has an average temperature of -5°C (23°F), with highs reaching up to 15°C (59°F) and lows dropping to around -32°C (-25°F).
JanFebMarAprMayJunJulAugSepOctNovDec161632425768726862473222
Data source: Temperature data for Cornell 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 Cornell

In Cornell in December, the total precipitation amount is 60 mm (2.4 in) spread over the course of 8 days.

December Precipitation Trends in Cornell

The chart displays monthly precipitation patterns in Cornell, 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 Cornell, December typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec32475689122120121123981154860
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cornell

In Cornell in December, humidity is 85%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that clings to your skin, making even the briefest outdoor excursions feel daunting and uncomfortable.

December Average Humidity in Cornell

This chart illustrates the average monthly humidity levels in Cornell, 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 Cornell is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Cornell

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

Maximum UV Index Levels in Cornell for December

The chart shows the monthly maximum UV Index (UVI) for Cornell 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 Cornell typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Cornell 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 Cornell Compares to Other Months

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

This table compares monthly weather conditions in Cornell, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)32 mm (1.2 inches)88%low
February Weather-9°C (17°F)47 mm (1.9 inches)89%moderate
March Weather0°C (32°F)56 mm (2.2 inches)86%moderate
April Weather6°C (42°F)89 mm (3.5 inches)85%high
May Weather14°C (58°F)122 mm (4.8 inches)79%very high
June Weather20°C (69°F)120 mm (4.7 inches)80%very high
July Weather22°C (72°F)121 mm (4.8 inches)80%very high
August Weather20°C (68°F)123 mm (4.9 inches)78%very high
September Weather17°C (62°F)98 mm (3.9 inches)80%high
October Weather8°C (47°F)114 mm (4.5 inches)84%moderate
November Weather0°C (32°F)48 mm (1.9 inches)89%moderate
December Weather-5°C (23°F)60 mm (2.4 inches)85%low

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