December Weather in Bethlehem, United States

Last updated: June 24, 2025

In Bethlehem, United States, the average temperature in December hovers around 9°C (48°F). Expect a chilly minimum of -6°C (22°F), while the mercury could rise to a pleasant 24°C (75°F). This month, you can anticipate 135 mm (5.3 in) of precipitation spread across 11 days, contributing to an average humidity level of 89%. Prepare for a wet and cool adventure! 🌧️

December Temperature in Bethlehem

In December in Bethlehem, the average temperature is 9°C (48°F). Maximums can reach 24°C (75°F) and minimums can be as low as -6°C (22°F). Be prepared for a wide range of temperatures when traveling, and pack accordingly!

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

The chart illustrates December temperature patterns in Bethlehem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethlehem, December typically has an average temperature of 9°C (48°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (22°F).

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

December Precipitation in Bethlehem

In Bethlehem in December, the precipitation amount is 135 mm (5.3 in) over the course of 11 days.

December Precipitation Trends in Bethlehem

The chart displays monthly precipitation patterns in Bethlehem, 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 Bethlehem, December typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 11 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 Bethlehem

In Bethlehem in December humidity is 89%. With an average temperature of 9°C (48°F), this humidity feels like a chill that lingers in the air, wrapping around you like a damp blanket, making outdoor activities challenging and encouraging a cozy retreat indoors.

December Average Humidity in Bethlehem

This chart illustrates the average monthly humidity levels in Bethlehem, 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 Bethlehem is approximately 89%, 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 Bethlehem

In Bethlehem in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Bethlehem for better planning.

Maximum UV Index Levels in Bethlehem for December

The chart shows the monthly maximum UV Index (UVI) for Bethlehem 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 Bethlehem typically reaches 4, which falls under the moderate exposure category.

Data source: Bethlehem 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 Bethlehem Compares to Other Months

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

This table compares monthly weather conditions in Bethlehem, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (46°F)	108 mm (4.3 inches)	86%	moderate
February Weather	10°C (51°F)	147 mm (5.8 inches)	84%	high
March Weather	13°C (56°F)	130 mm (5.1 inches)	83%	very high
April Weather	17°C (62°F)	123 mm (4.8 inches)	81%	very high
May Weather	21°C (71°F)	125 mm (4.9 inches)	81%	extreme
June Weather	24°C (76°F)	127 mm (5.0 inches)	81%	extreme
July Weather	26°C (79°F)	118 mm (4.7 inches)	83%	extreme
August Weather	26°C (78°F)	147 mm (5.8 inches)	81%	very high
September Weather	23°C (75°F)	116 mm (4.6 inches)	82%	very high
October Weather	19°C (66°F)	141 mm (5.5 inches)	78%	very high
November Weather	11°C (52°F)	80 mm (3.1 inches)	86%	high
December Weather	9°C (48°F)	135 mm (5.3 inches)	89%	moderate