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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 -5°C (24°F). However, you can expect a range where the minimum dips to -26°C (-14°F) and the maximum can reach up to 14°C (58°F). The region experiences 116 mm (4.6 in) of precipitation over approximately 10 days, accompanied by a high average humidity of 85%.

December Temperature in Mercer

In December in Mercer, the average temperature is -5°C (24°F). Maximums can reach 14°C (58°F), and minimums can drop as low as -26°C (-14°F). It's important to be prepared for cold weather fluctuations if you plan to visit during this time.

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 -5°C (24°F), with highs reaching up to 14°C (58°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec192129415464696860493424
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 total precipitation amount is 116 mm (4.6 in) over a span of 10 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 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec85847212787831218269129112116
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 85%. With an average temperature of -5°C (24°F), this humidity feels like a biting chill that penetrates your clothing, making every step outside feel more daunting and uninviting for traveling.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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-7°C (19°F)85 mm (3.3 inches)91%low
February Weather-6°C (22°F)84 mm (3.3 inches)89%moderate
March Weather-2°C (29°F)72 mm (2.8 inches)85%moderate
April Weather5°C (42°F)127 mm (5.0 inches)84%very high
May Weather12°C (54°F)87 mm (3.4 inches)78%very high
June Weather18°C (64°F)83 mm (3.3 inches)72%very high
July Weather20°C (69°F)120 mm (4.7 inches)75%very high
August Weather20°C (68°F)82 mm (3.2 inches)74%very high
September Weather16°C (61°F)69 mm (2.7 inches)77%high
October Weather9°C (49°F)129 mm (5.1 inches)85%moderate
November Weather1°C (35°F)112 mm (4.4 inches)86%moderate
December Weather-5°C (24°F)116 mm (4.6 inches)85%low

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