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December Weather in Merrill, United States

Last updated: June 24, 2025

In December, the average temperature in Merrill, United States hovers around 0°C (33°F). Expect chilly days with minimums dropping to -11°C (12°F) and occasional highs reaching 15°C (59°F). The weather can be quite damp, with an average precipitation of 54 mm (2.1 in) spread over 10 days, and you might feel the humidity at a notable 86%.

December Temperature in Merrill

In December in Merrill, the average temperature is 0°C (33°F). Maximum temperatures can reach 15°C (59°F), while minimums can drop as low as -11°C (12°F). Pack accordingly to ensure a comfortable and enjoyable trip!

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

The chart illustrates December temperature patterns in Merrill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merrill, December typically has an average temperature of 0°C (33°F), with highs reaching up to 15°C (59°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec343541475565737262493933
Data source: Temperature data for Merrill 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 Merrill

In Merrill in December, the total precipitation amount is 54 mm (2.1 in) over the course of 10 days.

December Precipitation Trends in Merrill

The chart displays monthly precipitation patterns in Merrill, 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 Merrill, December typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6573644643174417344954
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Merrill

In Merrill in December humidity is 86%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that permeates your clothes, making traveling uncomfortable and necessitating warm, layered clothing to stay dry and cozy.

December Average Humidity in Merrill

This chart illustrates the average monthly humidity levels in Merrill, 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 Merrill is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Merrill

In Merrill 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 Merrill, you can check the information here.

Maximum UV Index Levels in Merrill for December

The chart shows the monthly maximum UV Index (UVI) for Merrill 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 Merrill typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
Data source: Merrill 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 Merrill Compares to Other Months

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

This table compares monthly weather conditions in Merrill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)65 mm (2.5 inches)86%moderate
February Weather2°C (36°F)73 mm (2.9 inches)87%moderate
March Weather5°C (41°F)64 mm (2.5 inches)86%high
April Weather8°C (47°F)46 mm (1.8 inches)83%very high
May Weather13°C (56°F)43 mm (1.7 inches)72%extreme
June Weather18°C (65°F)17 mm (0.7 inches)67%extreme
July Weather23°C (74°F)4 mm (0.2 inches)56%extreme
August Weather22°C (72°F)4 mm (0.2 inches)42%very high
September Weather17°C (63°F)17 mm (0.7 inches)46%very high
October Weather10°C (50°F)34 mm (1.3 inches)67%high
November Weather4°C (40°F)49 mm (1.9 inches)86%moderate
December Weather0°C (33°F)54 mm (2.1 inches)86%moderate

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