Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The start of December in Altoona, Pennsylvania, comes with a reduction in the average high-temperature, receding from a frosty 46.6°F (8.1°C) in November to a cold 36.9°F (2.7°C). During the nights in December, Altoona experiences a consistent average temperature of 26.6°F (-3°C).Humidity
In December, the average relative humidity in Altoona is 84%.Rainfall
In December, the rain falls for 12.3 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 165 rainfall days, and 25.31" (643mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Altoona. In December, it is snowing for 11.1 days. Throughout December, 3.5" (89mm) of snow is accumulated. Throughout the year, in Altoona, there are 58.4 snowfall days, and 20.59" (523mm) of snow is accumulated.Daylight
December has the shortest days of the year in Altoona, 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
With an average maximum UV index of 1, December is the month with the lowest UV index in Altoona. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Frequently asked questions
How cold is December in Altoona?
What is the average humidity in December in Altoona?
How many days does it rain in December in Altoona?
How much does it snow in Altoona in December?
What is the month with the shortest days in Altoona?
What is the average length of the day in December in Altoona?
What time are sunrise and sunset in December in Altoona?
How many hours of sunshine does Altoona have in December?
What is the month with the lowest UV index in Altoona?
How high is the UV index in December in Altoona?
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 2min
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 4min
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).
Altoona, Pennsylvania, USA
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