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December Weather in Summit, United States

Last updated: June 24, 2025

In Summit, United States, the average temperature in December hovers around 1°C (34°F), with temperatures dipping as low as -19°C (-2°F) and climbing up to a maximum of 18°C (64°F). Expect some precipitation, totaling 63 mm (2.5 in) over approximately 8 days, and prepare for a relatively high average humidity of 84%.

December Temperature in Summit

In December in Summit, the average temperature is 1°C (34°F). The maximum can reach 18°C (64°F), and the minimum can be as low as -19°C (-2°F). Travelers should prepare for a wide range of temperatures and dress in layers to ensure comfort during their visit.

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

The chart illustrates December temperature patterns in Summit, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summit, December typically has an average temperature of 1°C (34°F), with highs reaching up to 18°C (64°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec272939475970747368554034
Data source: Temperature data for Summit 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 Summit

In Summit in December, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

December Precipitation Trends in Summit

The chart displays monthly precipitation patterns in Summit, 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 Summit, December typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec68709512515614410484781426563
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Summit

In Summit in December humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

December Average Humidity in Summit

This chart illustrates the average monthly humidity levels in Summit, 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 Summit is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Summit

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

Maximum UV Index Levels in Summit for December

The chart shows the monthly maximum UV Index (UVI) for Summit 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 Summit typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Summit 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 Summit Compares to Other Months

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

This table compares monthly weather conditions in Summit, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)68 mm (2.7 inches)82%moderate
February Weather-2°C (29°F)70 mm (2.7 inches)83%moderate
March Weather4°C (39°F)95 mm (3.7 inches)84%high
April Weather8°C (47°F)125 mm (4.9 inches)85%very high
May Weather15°C (59°F)156 mm (6.1 inches)79%very high
June Weather21°C (70°F)144 mm (5.7 inches)82%very high
July Weather24°C (75°F)104 mm (4.1 inches)80%very high
August Weather23°C (73°F)84 mm (3.3 inches)81%very high
September Weather20°C (68°F)78 mm (3.1 inches)80%very high
October Weather13°C (55°F)142 mm (5.6 inches)82%high
November Weather4°C (40°F)65 mm (2.6 inches)88%moderate
December Weather1°C (34°F)63 mm (2.5 inches)84%low

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