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December Weather in Altoona, United States

Last updated: June 24, 2025

In Altoona, United States, the average temperature in December hovers around -4°C (24°F), with a chilling minimum of -29°C (-19°F) and a surprising maximum of 16°C (61°F). Expect precipitation totaling 51 mm (2.0 in) across about 8 days, while the average humidity remains high at 85%. Prepare for a month of contrasts and winter's embrace!

December Temperature in Altoona

In December in Altoona, the average temperature is -4°C (24°F), with maximums reaching up to 16°C (61°F) and minimums dropping as low as -29°C (-19°F). Visitors should be prepared for a wide range of temperatures and dress accordingly for both chilly and mild weather.

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 -4°C (24°F), with highs reaching up to 16°C (61°F) and lows dropping to around -29°C (-19°F).
JanFebMarAprMayJunJulAugSepOctNovDec171833435870736963483324
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 51 mm (2.0 in), spread over a duration of 8 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 51 mm (2.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec33485595130132117127961115151
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 85%. With an average temperature of -4°C (24°F), this humidity feels like a biting chill that penetrates your layers, making outdoor exploration uncomfortable and urging you to seek warm shelter frequently.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
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 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 Altoona, you can visit Hourly UV Index in Altoona.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458810997532
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 Weather-8°C (17°F)33 mm (1.3 inches)88%low
February Weather-8°C (18°F)48 mm (1.9 inches)89%moderate
March Weather1°C (34°F)55 mm (2.2 inches)86%moderate
April Weather6°C (44°F)95 mm (3.7 inches)85%very high
May Weather15°C (59°F)130 mm (5.1 inches)79%very high
June Weather21°C (70°F)132 mm (5.2 inches)80%very high
July Weather23°C (73°F)117 mm (4.6 inches)80%very high
August Weather21°C (70°F)127 mm (5.0 inches)78%very high
September Weather17°C (63°F)96 mm (3.8 inches)80%high
October Weather9°C (48°F)111 mm (4.4 inches)84%moderate
November Weather1°C (34°F)51 mm (2.0 inches)89%moderate
December Weather-4°C (24°F)51 mm (2.0 inches)85%low

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