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December Weather in Rolla, United States

Last updated: June 24, 2025

In December, the average temperature in Rolla, United States hovers around 4°C (40°F), with extremes ranging from a chilly -15°C (6°F) to a warm 25°C (77°F). Expect around 56 mm (2.2 in) of precipitation over typically 7 days, while the atmosphere remains quite humid, with an average humidity of 86%.

December Temperature in Rolla

In December in Rolla, the average temperature is 4°C (40°F), with maximums that can reach 25°C (77°F) and minimums that can drop as low as -15°C (6°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Rolla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rolla, December typically has an average temperature of 4°C (40°F), with highs reaching up to 25°C (77°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec343648556675797672584540
Data source: Temperature data for Rolla 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 Rolla

In Rolla in December, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.

December Precipitation Trends in Rolla

The chart displays monthly precipitation patterns in Rolla, 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 Rolla, December typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec80901301401798590102521126757
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rolla

In Rolla in December humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

December Average Humidity in Rolla

This chart illustrates the average monthly humidity levels in Rolla, 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 Rolla is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rolla

In Rolla 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 Rolla, you can check the information here.

Maximum UV Index Levels in Rolla for December

The chart shows the monthly maximum UV Index (UVI) for Rolla 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 Rolla typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109753
Data source: Rolla 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 Rolla Compares to Other Months

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

This table compares monthly weather conditions in Rolla, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)80 mm (3.1 inches)83%moderate
February Weather2°C (37°F)90 mm (3.6 inches)81%moderate
March Weather9°C (48°F)130 mm (5.1 inches)80%high
April Weather13°C (55°F)140 mm (5.5 inches)80%very high
May Weather19°C (66°F)179 mm (7.0 inches)83%very high
June Weather24°C (76°F)85 mm (3.3 inches)83%extreme
July Weather26°C (79°F)90 mm (3.5 inches)76%extreme
August Weather24°C (76°F)102 mm (4.0 inches)69%very high
September Weather22°C (72°F)52 mm (2.1 inches)68%very high
October Weather15°C (59°F)112 mm (4.4 inches)72%high
November Weather7°C (45°F)67 mm (2.6 inches)83%moderate
December Weather4°C (40°F)56 mm (2.2 inches)86%moderate

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