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December Weather in Grundy, United States

Last updated: June 24, 2025

In December, the average temperature in Grundy, United States hovers around 5°C (41°F). Be prepared for a range of temperatures, with a minimum dipping to -18°C (0°F) and a potential maximum reaching 20°C (69°F). Expect approximately 129 mm (5.1 in) of precipitation over 12 days, contributing to an average humidity of 86%.

December Temperature in Grundy

In December in Grundy, the average temperature is 5°C (41°F). Maximums can reach 20°C (69°F), while minimums can drop as low as -18°C (0°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates December temperature patterns in Grundy, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grundy, December typically has an average temperature of 5°C (41°F), with highs reaching up to 20°C (69°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec364247556470747268594541
Data source: Temperature data for Grundy 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 Grundy

In Grundy in December, the total precipitation amount is 129 mm (5.1 in) over the course of 12 days.

December Precipitation Trends in Grundy

The chart displays monthly precipitation patterns in Grundy, 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 Grundy, December typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec9816812614313815210712410513083129
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grundy

In Grundy in December humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

December Average Humidity in Grundy

This chart illustrates the average monthly humidity levels in Grundy, 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 Grundy is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grundy

In Grundy 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 Grundy, you can check the information here.

Maximum UV Index Levels in Grundy for December

The chart shows the monthly maximum UV Index (UVI) for Grundy 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 Grundy typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Grundy 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 Grundy Compares to Other Months

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

This table compares monthly weather conditions in Grundy, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)98 mm (3.8 inches)87%moderate
February Weather5°C (42°F)168 mm (6.6 inches)87%high
March Weather8°C (47°F)126 mm (5.0 inches)86%very high
April Weather13°C (55°F)143 mm (5.6 inches)84%very high
May Weather18°C (64°F)138 mm (5.4 inches)83%extreme
June Weather21°C (70°F)152 mm (6.0 inches)83%extreme
July Weather23°C (74°F)107 mm (4.2 inches)79%extreme
August Weather22°C (72°F)124 mm (4.9 inches)66%very high
September Weather20°C (68°F)105 mm (4.1 inches)68%very high
October Weather15°C (59°F)130 mm (5.1 inches)78%high
November Weather7°C (45°F)82 mm (3.2 inches)89%moderate
December Weather5°C (41°F)129 mm (5.1 inches)86%moderate

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