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December Weather in Southbury, United States

Last updated: June 24, 2025

In December, the average temperature in Southbury, United States hovers around 1°C (35°F). Prepare for chilly days, as the temperature can dip as low as -15°C (5°F), while it can rise to a maximum of 16°C (62°F). During this time, expect about 121 mm (4.8 in) of precipitation spread over 10 days, contributing to an average humidity of 80%.

December Temperature in Southbury

In December in Southbury, the average temperature is 1°C (35°F). The maximum can reach 16°C (62°F), and the minimum can be as low as -15°C (5°F). Travelers should prepare for a wide range of temperatures, packing both warm clothing for the cold and lighter layers for the milder days.

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

The chart illustrates December temperature patterns in Southbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Southbury, December typically has an average temperature of 1°C (35°F), with highs reaching up to 16°C (62°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec303338495969747366564335
Data source: Temperature data for Southbury 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 Southbury

In Southbury in December, the precipitation amount is 121 mm (4.8 in) spread over a period of 10 days.

December Precipitation Trends in Southbury

The chart displays monthly precipitation patterns in Southbury, 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 Southbury, December typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec71969112911210314310611414394121
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Southbury

In Southbury in December, humidity is 80%. With an average temperature of 1°C (35°F), this humidity feels like a cold, damp embrace that makes traveling quite uncomfortable, as it seeps into your clothes and makes the air feel heavier, making it hard to stay warm and dry while exploring.

December Average Humidity in Southbury

This chart illustrates the average monthly humidity levels in Southbury, 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 Southbury is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Southbury

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

Maximum UV Index Levels in Southbury for December

The chart shows the monthly maximum UV Index (UVI) for Southbury 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 Southbury typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Southbury 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 Southbury Compares to Other Months

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

This table compares monthly weather conditions in Southbury, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)71 mm (2.8 inches)84%moderate
February Weather1°C (33°F)96 mm (3.8 inches)82%moderate
March Weather4°C (39°F)91 mm (3.6 inches)81%high
April Weather9°C (49°F)129 mm (5.1 inches)78%very high
May Weather15°C (59°F)112 mm (4.4 inches)69%very high
June Weather20°C (69°F)102 mm (4.0 inches)69%very high
July Weather24°C (75°F)143 mm (5.6 inches)62%very high
August Weather23°C (73°F)106 mm (4.2 inches)65%very high
September Weather19°C (67°F)114 mm (4.5 inches)68%very high
October Weather14°C (57°F)143 mm (5.6 inches)74%high
November Weather6°C (43°F)94 mm (3.7 inches)82%moderate
December Weather1°C (35°F)121 mm (4.8 inches)80%low

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