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December Weather in Sweet Home, United States

Last updated: June 24, 2025

In December, the average temperature in Sweet Home, United States hovers around 4°C (40°F). Expect a range from a chilly -7°C (20°F) to a mild 18°C (65°F). Be prepared for frequent rain, with an average precipitation of 247 mm (9.7 in) spread over 20 days, and a high humidity level of 87% that adds to the atmosphere.

December Temperature in Sweet Home

In December in Sweet Home, the average temperature is 4°C (40°F). Maximum temperatures can reach 18°C (65°F), while minimums can drop as low as -7°C (20°F). It's advisable to pack layers for your trip to stay comfortable during the varied temperatures.

December Weather in Sweet Home: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sweet Home, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sweet Home, December typically has an average temperature of 4°C (40°F), with highs reaching up to 18°C (65°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec403943495562686962514540
Data source: Temperature data for Sweet Home 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 Sweet Home

In Sweet Home in December, the precipitation amount is 247 mm (9.7 in) over the course of 20 days.

December Precipitation Trends in Sweet Home

The chart displays monthly precipitation patterns in Sweet Home, 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 Sweet Home, December typically receives around 247 mm (9.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec202246175172836549101152195247
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sweet Home

In Sweet Home in December humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

December Average Humidity in Sweet Home

This chart illustrates the average monthly humidity levels in Sweet Home, 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 Sweet Home is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sweet Home

In Sweet Home 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 Sweet Home, you can visit Hourly UV Index in Sweet Home.

Maximum UV Index Levels in Sweet Home for December

The chart shows the monthly maximum UV Index (UVI) for Sweet Home 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 Sweet Home typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Sweet Home 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 Sweet Home Compares to Other Months

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

This table compares monthly weather conditions in Sweet Home, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)202 mm (8.0 inches)85%low
February Weather4°C (40°F)245 mm (9.7 inches)84%moderate
March Weather6°C (44°F)175 mm (6.9 inches)85%high
April Weather9°C (49°F)172 mm (6.8 inches)83%high
May Weather13°C (55°F)83 mm (3.3 inches)83%very high
June Weather17°C (62°F)65 mm (2.6 inches)83%very high
July Weather20°C (69°F)4 mm (0.2 inches)82%very high
August Weather21°C (69°F)9 mm (0.4 inches)74%very high
September Weather17°C (62°F)101 mm (4.0 inches)71%very high
October Weather11°C (52°F)152 mm (6.0 inches)81%moderate
November Weather7°C (45°F)195 mm (7.7 inches)87%moderate
December Weather4°C (40°F)247 mm (9.7 inches)87%low

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