December Weather in Delmar, United States

Last updated: June 24, 2025

In December, the average temperature in Delmar, United States hovers around 6°C (43°F). Expect a chill in the air, with minimums plunging to -10°C (14°F) and maximums reaching a pleasant 21°C (70°F). Be prepared for some drizzle too, as precipitation amounts can hit 98 mm (3.8 in) over about 10 days, accompanied by an average humidity of 84%.

December Temperature in Delmar

In December in Delmar, the average temperature is 6°C (43°F), with a maximum reaching 21°C (70°F) and a minimum dropping as low as -10°C (14°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both mild and chilly conditions.

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

The chart illustrates December temperature patterns in Delmar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Delmar, December typically has an average temperature of 6°C (43°F), with highs reaching up to 21°C (70°F) and lows dropping to around -10°C (14°F).

Data source: Temperature data for Delmar generated using information from the Copernicus Climate Change Service.

December Precipitation in Delmar

In Delmar in December, the precipitation amount is 98 mm (3.8 in) spread over a period of 10 days.

December Precipitation Trends in Delmar

The chart displays monthly precipitation patterns in Delmar, 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 Delmar, December typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Delmar

In Delmar in December, humidity is 84%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor excursions uncomfortable and prompting travelers to seek refuge indoors or find warm, sheltered spots to enjoy their surroundings.

December Average Humidity in Delmar

This chart illustrates the average monthly humidity levels in Delmar, 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 Delmar is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Delmar

In Delmar 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 Delmar, you can check the information here.

Maximum UV Index Levels in Delmar for December

The chart shows the monthly maximum UV Index (UVI) for Delmar 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 Delmar typically reaches 3, which falls under the moderate exposure category.

Data source: Delmar 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 Delmar Compares to Other Months

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

This table compares monthly weather conditions in Delmar, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	66 mm (2.6 inches)	84%	moderate
February Weather	6°C (43°F)	93 mm (3.7 inches)	83%	moderate
March Weather	9°C (48°F)	93 mm (3.7 inches)	83%	high
April Weather	14°C (57°F)	87 mm (3.4 inches)	81%	very high
May Weather	19°C (66°F)	121 mm (4.7 inches)	78%	very high
June Weather	24°C (75°F)	127 mm (5.0 inches)	79%	very high
July Weather	27°C (80°F)	158 mm (6.2 inches)	74%	very high
August Weather	26°C (78°F)	165 mm (6.5 inches)	72%	very high
September Weather	23°C (73°F)	104 mm (4.1 inches)	75%	very high
October Weather	18°C (64°F)	122 mm (4.8 inches)	81%	high
November Weather	10°C (50°F)	83 mm (3.3 inches)	85%	moderate
December Weather	6°C (43°F)	98 mm (3.8 inches)	84%	moderate