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December Weather in Slippery Rock, United States

Last updated: June 24, 2025

In Slippery Rock, United States, the average temperature in December hovers around 1°C (35°F), with minimums plunging to -15°C (5°F) and maximums reaching up to 17°C (62°F). Expect about 104 mm (4.1 in) of precipitation spread over 12 days, contributing to a high average humidity of 86%.

December Temperature in Slippery Rock

In December in Slippery Rock, the average temperature is 1°C (35°F), with maximums reaching 17°C (62°F) and minimums plummeting to as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to enjoy their time in Slippery Rock.

December Weather in Slippery Rock: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Slippery Rock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Slippery Rock, December typically has an average temperature of 1°C (35°F), with highs reaching up to 17°C (62°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec293239496168737166554034
Data source: Temperature data for Slippery Rock 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 Slippery Rock

In Slippery Rock in December, the total precipitation amount is 104 mm (4.1 in) spread over 12 days.

December Precipitation Trends in Slippery Rock

The chart displays monthly precipitation patterns in Slippery Rock, 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 Slippery Rock, December typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec102117106141150140146101119129104104
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Slippery Rock

In Slippery Rock in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.

December Average Humidity in Slippery Rock

This chart illustrates the average monthly humidity levels in Slippery Rock, 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 Slippery Rock 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 Slippery Rock

In Slippery Rock 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 Slippery Rock, you can visit Hourly UV Index in Slippery Rock.

Maximum UV Index Levels in Slippery Rock for December

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

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

This table compares monthly weather conditions in Slippery Rock, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)102 mm (4.0 inches)88%moderate
February Weather0°C (33°F)117 mm (4.6 inches)88%moderate
March Weather4°C (39°F)106 mm (4.2 inches)87%high
April Weather10°C (49°F)141 mm (5.6 inches)87%very high
May Weather16°C (61°F)150 mm (5.9 inches)81%very high
June Weather20°C (69°F)139 mm (5.5 inches)83%very high
July Weather23°C (74°F)145 mm (5.7 inches)82%very high
August Weather22°C (71°F)101 mm (4.0 inches)76%very high
September Weather19°C (66°F)119 mm (4.7 inches)77%very high
October Weather13°C (56°F)129 mm (5.1 inches)82%high
November Weather5°C (41°F)104 mm (4.1 inches)89%moderate
December Weather1°C (35°F)104 mm (4.1 inches)86%low

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