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December Weather in Mercer, United States

Last updated: June 24, 2025

In December, the average temperature in Mercer, United States hovers around 1°C (34°F). During this time, temperatures can plunge to a minimum of -17°C (2°F), while reaching a comfortable maximum of 17°C (63°F). Expect 106 mm (4.2 in) of precipitation spread over 12 days, contributing to an average humidity level of 86%. Stay prepared for a mix of chilly days and damp conditions!

December Temperature in Mercer

In December in Mercer, the average temperature is 1°C (34°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -17°C (2°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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

The chart illustrates December temperature patterns in Mercer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercer, December typically has an average temperature of 1°C (34°F), with highs reaching up to 17°C (63°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec283138486068737165554034
Data source: Temperature data for Mercer 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 Mercer

In Mercer in December, the precipitation amount is 106 mm (4.2 in), occurring over a span of 12 days.

December Precipitation Trends in Mercer

The chart displays monthly precipitation patterns in Mercer, 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 Mercer, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec101110115144149140146105113127109106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mercer

In Mercer in December, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

December Average Humidity in Mercer

This chart illustrates the average monthly humidity levels in Mercer, 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 Mercer is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mercer

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

Maximum UV Index Levels in Mercer for December

The chart shows the monthly maximum UV Index (UVI) for Mercer 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 Mercer typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Mercer 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 Mercer Compares to Other Months

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

This table compares monthly weather conditions in Mercer, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)101 mm (4.0 inches)88%moderate
February Weather0°C (32°F)110 mm (4.3 inches)88%moderate
March Weather4°C (39°F)115 mm (4.5 inches)87%high
April Weather9°C (49°F)144 mm (5.7 inches)87%very high
May Weather16°C (60°F)149 mm (5.9 inches)81%very high
June Weather20°C (68°F)140 mm (5.5 inches)83%very high
July Weather23°C (73°F)146 mm (5.8 inches)82%very high
August Weather21°C (71°F)105 mm (4.1 inches)76%very high
September Weather19°C (66°F)113 mm (4.4 inches)77%very high
October Weather13°C (55°F)127 mm (5.0 inches)82%high
November Weather4°C (40°F)109 mm (4.3 inches)89%moderate
December Weather1°C (34°F)106 mm (4.2 inches)86%low

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