December weather forecastAltoona, PA
December
Weather in December
Rounding off the year, December in Altoona, Pennsylvania reveals prominent winter characteristics. The frequency of snowfall increases while the rain ebbs considerably. With diminished daylight, the temperatures exhibit a significant dip. Wind speeds peak in December, reinforcing the winter chill in the city. Concisely, the month of December is characterized by the coldest weather with temperature highs at 36.9°F (2.7°C) and lows plunging to a freezing 26.6°F (-3°C).Temperature
December's arrival corresponds with a decrease in average high-temperatures, from November's chilly 46.6°F (8.1°C) to an icy 36.9°F (2.7°C). Altoona cools down to an average low-temperature of 26.6°F (-3°C) throughout the month of December.Humidity
The average relative humidity in December is 84%.Rainfall
In Altoona, during December, the rain falls for 12.3 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Altoona, during the entire year, the rain falls for 165 days and collects up to 25.31" (643mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Altoona, in December, during 11.1 snowfall days, 3.5" (89mm) of snow is typically accumulated. Throughout the year, there are 58.4 snowfall days, and 20.59" (523mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:18 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:56 pm EST.
Sunshine
In December, the average sunshine in Altoona is 3.7h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 1 during December translates into the following directions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Altoona, PA
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 26.6°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in December
Altoona, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Altoona, PA
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Altoona, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in December
Altoona, PA
- Average rainfall in December: 2.17"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is November (1.57").
Average rainfall days in December
Altoona, PA
- Average rainfall days in December: 12.3 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (9.8 days).
Average snowfall in December
Altoona, PA
- Average snowfall in December: 3.5"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Altoona, PA
- Average snowfall days in December: 11.1 days
The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Altoona, PA
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Altoona, PA
- Average sunshine days in December: 11.7 days
The month with the most sunshine days is November (15.3 days).
The month with the least sunshine days is February (8.6 days).
Average UV index in December
Altoona, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Altoona, PA
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in December
Altoona, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
