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December Weather in Grafton, United States

Last updated: June 24, 2025

In December, the average temperature in Grafton, United States hovers around 0°C (32°F), with fluctuations that can dip as low as -20°C (-4°F) and peak at a comfortable 17°C (63°F). Expect some moisture in the air, with an average precipitation of 52 mm (2.1 in) spread over 7 days, contributing to a high average humidity of 81%.

December Temperature in Grafton

In December in Grafton, the average temperature is 0°C (32°F). Maximums can reach 17°C (63°F) and minimums can be as low as -20°C (-4°F). Travelers should be prepared for a wide range of temperatures, from chilly conditions to milder days, making it essential to pack accordingly.

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

The chart illustrates December temperature patterns in Grafton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grafton, December typically has an average temperature of 0°C (32°F), with highs reaching up to 17°C (63°F) and lows dropping to around -20°C (-4°F).
JanFebMarAprMayJunJulAugSepOctNovDec242535435364727165523831
Data source: Temperature data for Grafton 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 Grafton

In Grafton in December, the precipitation amount is 52 mm (2.1 in) over the course of 7 days.

December Precipitation Trends in Grafton

The chart displays monthly precipitation patterns in Grafton, 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 Grafton, December typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec59576810813110188771001195252
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grafton

In Grafton in December, humidity is 81%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm and dry while traveling.

December Average Humidity in Grafton

This chart illustrates the average monthly humidity levels in Grafton, 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 Grafton is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grafton

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

Maximum UV Index Levels in Grafton for December

The chart shows the monthly maximum UV Index (UVI) for Grafton 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 Grafton typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Grafton 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 Grafton Compares to Other Months

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

This table compares monthly weather conditions in Grafton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)59 mm (2.3 inches)85%low
February Weather-4°C (25°F)57 mm (2.2 inches)85%moderate
March Weather2°C (35°F)68 mm (2.7 inches)85%moderate
April Weather6°C (43°F)108 mm (4.3 inches)85%very high
May Weather12°C (54°F)131 mm (5.2 inches)78%very high
June Weather18°C (65°F)101 mm (4.0 inches)80%very high
July Weather22°C (72°F)88 mm (3.5 inches)78%very high
August Weather22°C (71°F)77 mm (3.0 inches)76%very high
September Weather18°C (65°F)100 mm (3.9 inches)79%high
October Weather11°C (53°F)119 mm (4.7 inches)83%moderate
November Weather3°C (38°F)52 mm (2.1 inches)88%moderate
December Weather0°C (32°F)52 mm (2.1 inches)81%low

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