December Weather in Plain, United States

Last updated: June 24, 2025

In Plain, United States, the average temperature in December hovers around -2°C (29°F). However, be prepared for fluctuations, as temperatures can dip as low as -23°C (-8°F) and rise to a maximum of 19°C (66°F). During this month, expect 43 mm (1.7 in) of precipitation over approximately 6 days, contributing to an average humidity level of 82%. Stay warm and dry!

December Temperature in Plain

In December in Plain, the average temperature is -2°C (29°F), with maximums reaching 19°C (66°F) and minimums plunging as low as -23°C (-8°F). It's essential to pack accordingly for your travels, as conditions can vary dramatically from day to night.

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

The chart illustrates December temperature patterns in Plain, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plain, December typically has an average temperature of -2°C (29°F), with highs reaching up to 19°C (66°F) and lows dropping to around -23°C (-8°F).

Data source: Temperature data for Plain generated using information from the Copernicus Climate Change Service.

December Precipitation in Plain

In Plain in December, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

December Precipitation Trends in Plain

The chart displays monthly precipitation patterns in Plain, 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 Plain, December typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Plain

In Plain in December, humidity is 82%. With an average temperature of -2°C (29°F), this humidity feels like a frigid chill that seeps into your bones, making travel quite uncomfortable and forcing you to bundle up tightly to ward off the damp cold that lingers in the air.

December Average Humidity in Plain

This chart illustrates the average monthly humidity levels in Plain, 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 Plain is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Plain

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

Maximum UV Index Levels in Plain for December

The chart shows the monthly maximum UV Index (UVI) for Plain 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 Plain typically reaches 2, which falls under the low exposure category.

Data source: Plain 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 Plain Compares to Other Months

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

This table compares monthly weather conditions in Plain, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	45 mm (1.8 inches)	84%	low
February Weather	-6°C (22°F)	55 mm (2.2 inches)	85%	moderate
March Weather	2°C (36°F)	56 mm (2.2 inches)	84%	moderate
April Weather	8°C (46°F)	85 mm (3.4 inches)	83%	very high
May Weather	15°C (60°F)	130 mm (5.1 inches)	75%	very high
June Weather	21°C (71°F)	113 mm (4.4 inches)	79%	very high
July Weather	24°C (75°F)	95 mm (3.7 inches)	75%	very high
August Weather	22°C (71°F)	106 mm (4.2 inches)	69%	very high
September Weather	18°C (65°F)	117 mm (4.6 inches)	74%	very high
October Weather	10°C (51°F)	114 mm (4.5 inches)	79%	moderate
November Weather	2°C (36°F)	45 mm (1.8 inches)	88%	moderate
December Weather	-2°C (29°F)	43 mm (1.7 inches)	82%	low