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December Weather in Bethel Park, United States

Last updated: June 24, 2025

In December, the average temperature in Bethel Park, United States hovers around 3°C (37°F). Expect temperature fluctuations ranging from a chilly -16°C (4°F) to a mild 18°C (65°F). During this period, 109 mm (4.3 in) of precipitation can be anticipated over approximately 12 days, with the air carrying a high average humidity of 86%.

December Temperature in Bethel Park

In December in Bethel Park, the average temperature is 3°C (37°F). The maximum can reach 18°C (65°F), while the minimum can drop as low as -16°C (4°F). Travelers should be prepared for a wide temperature range, bringing layered clothing to stay comfortable throughout their visit.

December Weather in Bethel Park: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Bethel Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethel Park, December typically has an average temperature of 3°C (37°F), with highs reaching up to 18°C (65°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec323642526370757368574337
Data source: Temperature data for Bethel Park 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 Bethel Park

In Bethel Park in December, the total precipitation amount is 109 mm (4.3 in) during a span of 12 days.

December Precipitation Trends in Bethel Park

The chart displays monthly precipitation patterns in Bethel Park, 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 Bethel Park, December typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec901241141301501661569712812590109
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bethel Park

In Bethel Park in December humidity is 86%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.

December Average Humidity in Bethel Park

This chart illustrates the average monthly humidity levels in Bethel Park, 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 Bethel Park is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bethel Park

In Bethel Park 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 Bethel Park, you can visit Hourly UV Index in Bethel Park.

Maximum UV Index Levels in Bethel Park for December

The chart shows the monthly maximum UV Index (UVI) for Bethel Park 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 Bethel Park typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Bethel Park 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 Bethel Park Compares to Other Months

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

This table compares monthly weather conditions in Bethel Park, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)90 mm (3.5 inches)88%moderate
February Weather2°C (36°F)124 mm (4.9 inches)88%moderate
March Weather6°C (42°F)114 mm (4.5 inches)87%high
April Weather11°C (52°F)130 mm (5.1 inches)87%very high
May Weather17°C (63°F)150 mm (5.9 inches)81%very high
June Weather21°C (70°F)166 mm (6.5 inches)83%very high
July Weather24°C (75°F)156 mm (6.1 inches)82%very high
August Weather23°C (73°F)97 mm (3.8 inches)76%very high
September Weather20°C (68°F)128 mm (5.1 inches)77%very high
October Weather14°C (58°F)125 mm (4.9 inches)82%high
November Weather6°C (43°F)90 mm (3.5 inches)89%moderate
December Weather3°C (37°F)109 mm (4.3 inches)86%low

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