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December Weather in Caldwell, United States

Last updated: June 24, 2025

In December, the average temperature in Caldwell, United States hovers around 2°C (35°F). Expect chilly days, with temperatures dipping as low as -9°C (16°F) and occasionally soaring to a maximum of 16°C (60°F). During this time, rainfall averages 33 mm (1.3 in) spread over 9 days, contributing to an average humidity level of 87%—perfect for cozy indoor activities!

December Temperature in Caldwell

In December in Caldwell, the average temperature is 2°C (35°F). The maximum can reach 16°C (60°F), while the minimum can drop to as low as -9°C (16°F). Travelers should be prepared for cold temperatures and varying weather conditions.

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

The chart illustrates December temperature patterns in Caldwell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Caldwell, December typically has an average temperature of 2°C (35°F), with highs reaching up to 16°C (60°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec343747546372827968544335
Data source: Temperature data for Caldwell 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 Caldwell

In Caldwell in December, the precipitation amount is 33 mm (1.3 in) over the course of 9 days.

December Precipitation Trends in Caldwell

The chart displays monthly precipitation patterns in Caldwell, 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 Caldwell, December typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec424331292816169182833
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Caldwell

In Caldwell 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 Caldwell

This chart illustrates the average monthly humidity levels in Caldwell, 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 Caldwell 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 Caldwell

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

Maximum UV Index Levels in Caldwell for December

The chart shows the monthly maximum UV Index (UVI) for Caldwell 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 Caldwell typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810111098542
Data source: Caldwell 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 Caldwell Compares to Other Months

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

This table compares monthly weather conditions in Caldwell, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)42 mm (1.7 inches)88%moderate
February Weather3°C (37°F)43 mm (1.7 inches)89%moderate
March Weather8°C (47°F)31 mm (1.2 inches)85%high
April Weather12°C (54°F)29 mm (1.2 inches)79%very high
May Weather17°C (63°F)28 mm (1.1 inches)71%very high
June Weather22°C (73°F)16 mm (0.6 inches)71%extreme
July Weather28°C (82°F)1 mm (0.0 inches)66%very high
August Weather26°C (80°F)5 mm (0.2 inches)50%very high
September Weather20°C (68°F)9 mm (0.4 inches)48%very high
October Weather12°C (54°F)18 mm (0.7 inches)65%moderate
November Weather6°C (43°F)28 mm (1.1 inches)84%moderate
December Weather2°C (35°F)33 mm (1.3 inches)87%low

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