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December Weather in Granite Falls, United States

Last updated: June 24, 2025

In December, the average temperature in Granite Falls, United States hovers around 4°C (39°F), with fluctuations that can dip as low as -13°C (8°F) and peak at 13°C (56°F). Be prepared for wet weather, as 295 mm (11.6 in) of precipitation is expected over about 20 days. With an average humidity of 88%, it's wise to dress warmly and stay dry during this chilly month!

December Temperature in Granite Falls

In December in Granite Falls, the average temperature is 4°C (39°F). The maximum can reach 13°C (56°F) and the minimum can be as low as -13°C (8°F). Travelers should be prepared for chilly weather and dress in layers to stay comfortable during their visit.

December Weather in Granite Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Granite Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Granite Falls, December typically has an average temperature of 4°C (39°F), with highs reaching up to 13°C (56°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec403843485559646459494439
Data source: Temperature data for Granite Falls 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 Granite Falls

In Granite Falls in December, the precipitation amount is 295 mm (11.6 in) over the course of 20 days.

December Precipitation Trends in Granite Falls

The chart displays monthly precipitation patterns in Granite Falls, 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 Granite Falls, December typically receives around 295 mm (11.6 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec25527220317299903232131246302296
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Granite Falls

In Granite Falls in December, humidity is 88%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm.

December Average Humidity in Granite Falls

This chart illustrates the average monthly humidity levels in Granite Falls, 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 Granite Falls is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Granite Falls

In Granite Falls 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 Granite Falls, you can visit Hourly UV Index in Granite Falls.

Maximum UV Index Levels in Granite Falls for December

The chart shows the monthly maximum UV Index (UVI) for Granite Falls 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 Granite Falls typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: Granite Falls 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 Granite Falls Compares to Other Months

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

This table compares monthly weather conditions in Granite Falls, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)255 mm (10.0 inches)86%low
February Weather3°C (38°F)272 mm (10.7 inches)86%moderate
March Weather6°C (44°F)203 mm (8.0 inches)87%moderate
April Weather9°C (49°F)172 mm (6.8 inches)84%high
May Weather13°C (55°F)99 mm (3.9 inches)81%very high
June Weather15°C (60°F)89 mm (3.5 inches)82%very high
July Weather18°C (64°F)32 mm (1.3 inches)79%very high
August Weather18°C (64°F)32 mm (1.3 inches)63%very high
September Weather15°C (59°F)131 mm (5.2 inches)62%high
October Weather9°C (49°F)246 mm (9.7 inches)83%moderate
November Weather7°C (44°F)302 mm (11.9 inches)89%low
December Weather4°C (39°F)295 mm (11.6 inches)88%low

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