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December Weather in Mack, United States

Last updated: June 24, 2025

In December, the average temperature in Mack, United States is a crisp 4°C (39°F). Expect the minimum to dip as low as -16°C (4°F), while the maximum can reach a mild 19°C (67°F). During this month, precipitation totals around 104 mm (4.1 in) across 9 days, contributing to an average humidity level of 87%.

December Temperature in Mack

In December in Mack, the average temperature is 4°C (39°F). Maximum can reach 19°C (67°F) and minimum can be as low as -16°C (4°F). Be sure to pack layers to stay comfortable while exploring the diverse weather conditions.

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

The chart illustrates December temperature patterns in Mack, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mack, December typically has an average temperature of 4°C (39°F), with highs reaching up to 19°C (67°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec333745546673777570594338
Data source: Temperature data for Mack 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 Mack

In Mack in December, the precipitation amount is 104 mm (4.1 in) over the course of 9 days.

December Precipitation Trends in Mack

The chart displays monthly precipitation patterns in Mack, 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 Mack, December typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7910413311612513011396799696104
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mack

In Mack in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

December Average Humidity in Mack

This chart illustrates the average monthly humidity levels in Mack, 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 Mack is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mack

In Mack 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 Mack, you can check the information here.

Maximum UV Index Levels in Mack for December

The chart shows the monthly maximum UV Index (UVI) for Mack 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 Mack typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Mack 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 Mack Compares to Other Months

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

This table compares monthly weather conditions in Mack, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)79 mm (3.1 inches)88%moderate
February Weather3°C (37°F)104 mm (4.1 inches)88%moderate
March Weather7°C (45°F)133 mm (5.2 inches)87%high
April Weather12°C (54°F)116 mm (4.5 inches)85%very high
May Weather19°C (66°F)125 mm (4.9 inches)81%very high
June Weather23°C (74°F)130 mm (5.1 inches)82%very high
July Weather25°C (78°F)113 mm (4.4 inches)81%very high
August Weather24°C (75°F)96 mm (3.8 inches)73%very high
September Weather21°C (71°F)79 mm (3.1 inches)73%very high
October Weather15°C (59°F)96 mm (3.8 inches)78%high
November Weather6°C (44°F)96 mm (3.8 inches)89%moderate
December Weather4°C (39°F)104 mm (4.1 inches)87%moderate

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