nomadseason

December Weather in Mercer, United States

Last updated: June 24, 2025

In Mercer, United States, the average temperature in December hovers around -7°C (20°F). Expect chilly extremes, with minimums dropping to -31°C (-24°F) and a maximum of 13°C (55°F). This month also brings approximately 70 mm (2.8 in) of precipitation spread over 11 days, while the average humidity lingers at a brisk 91%. Stay warm and prepare for wet days ahead!

December Temperature in Mercer

In December in Mercer, the average temperature is -7°C (20°F). Maximum temperatures can reach 13°C (55°F), while minimums can drop as low as -31°C (-24°F). It's essential to prepare for a wide temperature range when traveling to this location during this month.

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 -7°C (20°F), with highs reaching up to 13°C (55°F) and lows dropping to around -31°C (-24°F).
JanFebMarAprMayJunJulAugSepOctNovDec141427375465696558442920
Data source: Temperature data for Mercer generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 70 mm (2.8 in) distributed over 11 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 70 mm (2.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec36515392100121110126981185871
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Mercer

In Mercer in December humidity is 91%. With an average temperature of -7°C (20°F), this humidity feels like an icy embrace that clings to your skin, making travel uncomfortable and challenging as every breath feels damp and heavy in the frigid air.

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 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%89%85%76%71%70%71%73%82%88%91%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2457810987532
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-10°C (14°F)36 mm (1.4 inches)93%low
February Weather-10°C (14°F)51 mm (2.0 inches)93%moderate
March Weather-3°C (27°F)53 mm (2.1 inches)89%moderate
April Weather3°C (37°F)92 mm (3.6 inches)85%high
May Weather12°C (54°F)100 mm (3.9 inches)76%very high
June Weather18°C (65°F)121 mm (4.8 inches)71%very high
July Weather20°C (69°F)110 mm (4.3 inches)70%very high
August Weather18°C (65°F)126 mm (5.0 inches)71%very high
September Weather14°C (58°F)98 mm (3.9 inches)73%high
October Weather7°C (44°F)118 mm (4.7 inches)81%moderate
November Weather-2°C (29°F)58 mm (2.3 inches)87%moderate
December Weather-7°C (20°F)70 mm (2.8 inches)91%low

Compare Mercer's Climate with Cities Worldwide