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December Weather in Grayson, United States

Last updated: June 24, 2025

In Grayson, United States, the average temperature in December hovers around 5°C (41°F). Be prepared for a wide range, as temperatures can dip as low as -12°C (10°F) and peak at 20°C (69°F). Expect 118 mm (4.6 in) of precipitation over approximately 10 days, accompanied by an average humidity level of 87%.

December Temperature in Grayson

In December in Grayson, the average temperature is around 5°C (41°F), with maximums potentially reaching 20°C (69°F) and minimums dipping as low as -12°C (10°F). This varied climate makes it essential for travelers to pack accordingly for both mild and cold weather conditions.

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

The chart illustrates December temperature patterns in Grayson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grayson, 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 -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec364148566673787570604541
Data source: Temperature data for Grayson 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 Grayson

In Grayson in December, the total precipitation amount is 118 mm (4.6 in) over a span of 10 days.

December Precipitation Trends in Grayson

The chart displays monthly precipitation patterns in Grayson, 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 Grayson, December typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9313211012513017511814011311374118
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grayson

In Grayson in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

December Average Humidity in Grayson

This chart illustrates the average monthly humidity levels in Grayson, 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 Grayson is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grayson

In Grayson 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 Grayson, you can check the information here.

Maximum UV Index Levels in Grayson for December

The chart shows the monthly maximum UV Index (UVI) for Grayson 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 Grayson typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
Data source: Grayson 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 Grayson Compares to Other Months

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

This table compares monthly weather conditions in Grayson, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)93 mm (3.7 inches)88%moderate
February Weather5°C (41°F)132 mm (5.2 inches)88%moderate
March Weather9°C (48°F)110 mm (4.3 inches)87%high
April Weather13°C (56°F)125 mm (4.9 inches)85%very high
May Weather19°C (67°F)130 mm (5.1 inches)81%very high
June Weather23°C (73°F)175 mm (6.9 inches)82%very high
July Weather25°C (78°F)118 mm (4.6 inches)81%very high
August Weather24°C (75°F)140 mm (5.5 inches)73%very high
September Weather21°C (71°F)113 mm (4.4 inches)73%very high
October Weather16°C (60°F)113 mm (4.4 inches)78%high
November Weather7°C (46°F)74 mm (2.9 inches)89%moderate
December Weather5°C (41°F)118 mm (4.6 inches)87%moderate

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