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December Weather in Onset, United States

Last updated: June 24, 2025

In December, the average temperature in Onset, United States hovers around 3°C (38°F). Expect chilly days where the temperature can dip as low as -14°C (6°F), while occasional warmth can reach up to 17°C (63°F). Precipitation is notable, with around 116 mm (4.6 in) falling over 10 days, contributing to an average humidity of 80%. Be prepared for a brisk and damp atmosphere!

December Temperature in Onset

In December in Onset, the average temperature is 3°C (38°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -14°C (6°F). Be prepared for a wide range of weather conditions when traveling during this time.

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

The chart illustrates December temperature patterns in Onset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onset, December typically has an average temperature of 3°C (38°F), with highs reaching up to 17°C (63°F) and lows dropping to around -14°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec343539485767737367584637
Data source: Temperature data for Onset 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 Onset

In Onset in December, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

December Precipitation Trends in Onset

The chart displays monthly precipitation patterns in Onset, 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 Onset, December typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec829710712298901028110214393116
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Onset

In Onset in December, humidity is 80%. With an average temperature of 3°C (38°F), this humidity feels like a chilly dampness that clings to your skin, making traveling uncomfortable and forcing you to bundle up just to step outside.

December Average Humidity in Onset

This chart illustrates the average monthly humidity levels in Onset, 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 Onset is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Onset

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

Maximum UV Index Levels in Onset for December

The chart shows the monthly maximum UV Index (UVI) for Onset 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 Onset typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Onset 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 Onset Compares to Other Months

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

This table compares monthly weather conditions in Onset, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)82 mm (3.2 inches)84%moderate
February Weather2°C (36°F)97 mm (3.8 inches)84%moderate
March Weather4°C (39°F)107 mm (4.2 inches)82%high
April Weather9°C (48°F)122 mm (4.8 inches)79%very high
May Weather14°C (57°F)98 mm (3.9 inches)75%very high
June Weather19°C (67°F)90 mm (3.5 inches)78%very high
July Weather23°C (74°F)102 mm (4.0 inches)76%very high
August Weather23°C (74°F)81 mm (3.2 inches)76%very high
September Weather19°C (67°F)102 mm (4.0 inches)75%very high
October Weather14°C (58°F)143 mm (5.6 inches)75%high
November Weather8°C (46°F)93 mm (3.7 inches)80%moderate
December Weather3°C (38°F)116 mm (4.6 inches)80%low

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