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December Weather in Nampa, United States

Last updated: June 24, 2025

In December, the average temperature in Nampa, United States hovers around 2°C (35°F). You'll need to prepare for a range of conditions, as temperatures can dip to a chilly -9°C (16°F) or rise to a comfortable 15°C (59°F). Expect about 35 mm (1.4 in) of precipitation spread over 9 days, with a notably high average humidity of 87%.

December Temperature in Nampa

In December in Nampa, the average temperature is 2°C (35°F). Maximums can reach 15°C (59°F), while minimums can be as low as -9°C (16°F). When traveling during this month, be prepared for chilly weather and pack accordingly to enjoy your trip comfortably.

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

The chart illustrates December temperature patterns in Nampa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nampa, December typically has an average temperature of 2°C (35°F), with highs reaching up to 15°C (59°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec343747536272817968534335
Data source: Temperature data for Nampa 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 Nampa

In Nampa in December, the total precipitation amount reaches 35 mm (1.4 in) over the course of 9 days.

December Precipitation Trends in Nampa

The chart displays monthly precipitation patterns in Nampa, 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 Nampa, December typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4341343435192710212936
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Nampa

In Nampa in December, humidity is 87%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling feel uncomfortable and heavy, as each breath carries a hint of the cold, moist air that lingers around you.

December Average Humidity in Nampa

This chart illustrates the average monthly humidity levels in Nampa, 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 Nampa is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%85%79%71%71%66%50%48%65%84%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Nampa

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

Maximum UV Index Levels in Nampa for December

The chart shows the monthly maximum UV Index (UVI) for Nampa 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 Nampa typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810111198642
Data source: Nampa 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 Nampa Compares to Other Months

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

This table compares monthly weather conditions in Nampa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)43 mm (1.7 inches)88%moderate
February Weather3°C (37°F)41 mm (1.6 inches)89%moderate
March Weather8°C (47°F)34 mm (1.3 inches)85%high
April Weather12°C (54°F)34 mm (1.3 inches)79%very high
May Weather16°C (62°F)35 mm (1.4 inches)71%very high
June Weather22°C (72°F)19 mm (0.7 inches)71%extreme
July Weather27°C (82°F)1 mm (0.1 inches)66%extreme
August Weather26°C (79°F)7 mm (0.3 inches)50%very high
September Weather20°C (68°F)10 mm (0.4 inches)48%very high
October Weather12°C (53°F)21 mm (0.8 inches)65%high
November Weather6°C (43°F)29 mm (1.1 inches)84%moderate
December Weather2°C (35°F)35 mm (1.4 inches)87%low

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