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December Weather in Massac, United States

Last updated: June 24, 2025

In December, the average temperature in Massac, United States hovers around 6°C (44°F). Temperatures can vary significantly, with a minimum as low as -12°C (10°F) and peaking at a comfortable 23°C (74°F). Expect about 103 mm (4.0 in) of precipitation spread over 9 days, contributing to an average humidity of 88% in the air.

December Temperature in Massac

In December in Massac, the average temperature is 6°C (44°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -12°C (10°F). Be prepared for a wide range of temperatures when traveling during this month, as layers may be necessary to stay comfortable.

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

The chart illustrates December temperature patterns in Massac, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Massac, December typically has an average temperature of 6°C (44°F), with highs reaching up to 23°C (74°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec384151587077817874624743
Data source: Temperature data for Massac 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 Massac

In Massac in December, the precipitation amount is 103 mm (4.0 in) over the course of 9 days.

December Precipitation Trends in Massac

The chart displays monthly precipitation patterns in Massac, 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 Massac, December typically receives around 103 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec106146156143144114100958612299103
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Massac

In Massac in December humidity is 88%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less inviting and requiring warm, layered clothing to stay comfortable while exploring.

December Average Humidity in Massac

This chart illustrates the average monthly humidity levels in Massac, 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 Massac is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Massac

In Massac 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 Massac, you can check the information here.

Maximum UV Index Levels in Massac for December

The chart shows the monthly maximum UV Index (UVI) for Massac 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 Massac typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111110109753
Data source: Massac 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 Massac Compares to Other Months

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

This table compares monthly weather conditions in Massac, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)106 mm (4.2 inches)86%moderate
February Weather5°C (41°F)146 mm (5.7 inches)84%high
March Weather10°C (51°F)156 mm (6.1 inches)84%high
April Weather14°C (58°F)142 mm (5.6 inches)80%very high
May Weather21°C (70°F)144 mm (5.7 inches)82%extreme
June Weather25°C (77°F)114 mm (4.5 inches)83%extreme
July Weather27°C (81°F)100 mm (3.9 inches)79%very high
August Weather26°C (78°F)95 mm (3.8 inches)76%very high
September Weather23°C (74°F)86 mm (3.4 inches)75%very high
October Weather17°C (62°F)122 mm (4.8 inches)74%high
November Weather8°C (47°F)99 mm (3.9 inches)85%moderate
December Weather6°C (44°F)103 mm (4.0 inches)88%moderate

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