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December Weather in American Falls, United States

Last updated: June 24, 2025

In December, the average temperature in American Falls, United States hovers around -3°C (28°F). Be prepared for some chilly days, as temperatures can dip as low as -16°C (4°F), while the warmest days may reach up to 13°C (56°F). Expect 43 mm (1.7 in) of precipitation over about 9 days, and keep in mind that the average humidity is a brisk 87%. Bundle up and enjoy the winter atmosphere!

December Temperature in American Falls

In December in American Falls, the average temperature is -3°C (28°F). Maximums can reach 13°C (56°F), while minimums can drop to as low as -16°C (4°F). Be sure to pack warm clothing and prepare for a range of chilly weather if you're planning to visit during this time.

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

The chart illustrates December temperature patterns in American Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In American Falls, December typically has an average temperature of -3°C (28°F), with highs reaching up to 13°C (56°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec262938465566757263463727
Data source: Temperature data for American 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 American Falls

In American Falls in December, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.

December Precipitation Trends in American Falls

The chart displays monthly precipitation patterns in American 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 American Falls, December typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec435546515124131627383043
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in American Falls

In American Falls in December humidity is 87%. With an average temperature of -3°C (28°F), this humidity feels like a biting chill that clings to your skin, making travel quite uncomfortable and forcing you to bundle up extra just to stay warm.

December Average Humidity in American Falls

This chart illustrates the average monthly humidity levels in American 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 American Falls is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in American Falls

In American Falls in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in American Falls, you can check the information here.

Maximum UV Index Levels in American Falls for December

The chart shows the monthly maximum UV Index (UVI) for American 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 American Falls typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: American 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 American Falls Compares to Other Months

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

This table compares monthly weather conditions in American Falls, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)43 mm (1.7 inches)91%moderate
February Weather-2°C (29°F)55 mm (2.2 inches)92%moderate
March Weather3°C (38°F)46 mm (1.8 inches)85%high
April Weather8°C (46°F)51 mm (2.0 inches)76%very high
May Weather13°C (56°F)51 mm (2.0 inches)66%very high
June Weather19°C (67°F)24 mm (0.9 inches)62%extreme
July Weather24°C (76°F)13 mm (0.5 inches)53%extreme
August Weather22°C (73°F)16 mm (0.6 inches)42%very high
September Weather17°C (63°F)27 mm (1.1 inches)46%very high
October Weather8°C (47°F)38 mm (1.5 inches)64%high
November Weather3°C (37°F)30 mm (1.2 inches)83%moderate
December Weather-3°C (28°F)43 mm (1.7 inches)87%moderate

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