December Weather in Hillcrest, United States

Last updated: June 24, 2025

In December, the average temperature in Hillcrest, United States hovers around 15°C (59°F), with a range that can dip to a chilly -1°C (30°F) and reach a warm 28°C (83°F). Expect 104 mm (4.1 in) of precipitation over approximately 9 days, contributing to an average humidity of 84%. Stay prepared for a mix of weather!

December Temperature in Hillcrest

In December in Hillcrest, the average temperature is 15°C (59°F). Maximums can reach 28°C (83°F), and minimums can be as low as -1°C (30°F). Visitors should pack for a range of temperatures to fully enjoy their experience.

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

The chart illustrates December temperature patterns in Hillcrest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillcrest, December typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around -1°C (30°F).

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

December Precipitation in Hillcrest

In Hillcrest in December, the precipitation amount is 104 mm (4.1 in) over the course of 9 days.

December Precipitation Trends in Hillcrest

The chart displays monthly precipitation patterns in Hillcrest, 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 Hillcrest, December typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 9 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 Hillcrest

In Hillcrest in December, humidity is 84%. With an average temperature of 15°C (59°F), this humidity feels like an oppressive blanket wrapping around you, making it challenging to enjoy outdoor activities and travel comfortably.

December Average Humidity in Hillcrest

This chart illustrates the average monthly humidity levels in Hillcrest, 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 Hillcrest 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 Hillcrest

In Hillcrest in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Hillcrest.

Maximum UV Index Levels in Hillcrest for December

The chart shows the monthly maximum UV Index (UVI) for Hillcrest 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 Hillcrest typically reaches 5, which falls under the moderate exposure category.

Data source: Hillcrest 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 Hillcrest Compares to Other Months

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

This table compares monthly weather conditions in Hillcrest, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (56°F)	84 mm (3.3 inches)	78%	moderate
February Weather	15°C (59°F)	85 mm (3.3 inches)	81%	very high
March Weather	19°C (66°F)	72 mm (2.8 inches)	76%	very high
April Weather	21°C (70°F)	91 mm (3.6 inches)	79%	extreme
May Weather	25°C (77°F)	171 mm (6.7 inches)	79%	extreme
June Weather	28°C (82°F)	168 mm (6.6 inches)	74%	extreme
July Weather	28°C (84°F)	153 mm (6.0 inches)	71%	extreme
August Weather	29°C (84°F)	199 mm (7.9 inches)	68%	extreme
September Weather	27°C (80°F)	204 mm (8.1 inches)	73%	very high
October Weather	23°C (73°F)	105 mm (4.1 inches)	75%	very high
November Weather	17°C (63°F)	79 mm (3.1 inches)	78%	high
December Weather	15°C (59°F)	104 mm (4.1 inches)	84%	moderate