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December Weather in Altoona, United States

Last updated: June 24, 2025

In December, the average temperature in Altoona, United States is a cool 9°C (48°F). Expect temperature fluctuations, with minimums dropping to -7°C (20°F) and maximums soaring to 23°C (74°F). The region experiences about 150 mm (5.9 in) of precipitation across 12 days, accompanied by a high average humidity of 88%.

December Temperature in Altoona

In December in Altoona, the average temperature is 9°C (48°F), with maximums reaching 23°C (74°F) and minimums dropping as low as -7°C (20°F). It's advisable to pack layers to comfortably adapt to the varying temperatures while exploring the area.

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

The chart illustrates December temperature patterns in Altoona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altoona, December typically has an average temperature of 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627177807975665248
Data source: Temperature data for Altoona 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 Altoona

In Altoona in December, the total precipitation amount is 150 mm (5.9 in) over the course of 12 days.

December Precipitation Trends in Altoona

The chart displays monthly precipitation patterns in Altoona, 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 Altoona, December typically receives around 150 mm (5.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec12218416515710513411412010112880150
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Altoona

In Altoona in December, humidity is 88%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill settling into your bones, making outdoor exploration feel heavy and oppressive.

December Average Humidity in Altoona

This chart illustrates the average monthly humidity levels in Altoona, 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 Altoona is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Altoona

In Altoona 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 Altoona for better planning.

Maximum UV Index Levels in Altoona for December

The chart shows the monthly maximum UV Index (UVI) for Altoona 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 Altoona typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119764
Data source: Altoona 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 Altoona Compares to Other Months

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

This table compares monthly weather conditions in Altoona, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)122 mm (4.8 inches)85%moderate
February Weather10°C (51°F)184 mm (7.2 inches)84%high
March Weather14°C (57°F)165 mm (6.5 inches)82%very high
April Weather17°C (62°F)157 mm (6.2 inches)82%very high
May Weather22°C (72°F)105 mm (4.1 inches)81%extreme
June Weather25°C (77°F)134 mm (5.3 inches)77%extreme
July Weather27°C (80°F)114 mm (4.5 inches)77%extreme
August Weather26°C (79°F)120 mm (4.7 inches)72%extreme
September Weather24°C (76°F)101 mm (4.0 inches)73%very high
October Weather19°C (66°F)128 mm (5.0 inches)73%high
November Weather11°C (52°F)80 mm (3.1 inches)85%high
December Weather9°C (48°F)150 mm (5.9 inches)88%moderate

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