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 beginning of December signals a clear reduction in the average high-temperature, falling from an icy 39.6°F (4.2°C) in November to a freezing cold 24.8°F (-4°C). December witnesses an average nighttime temperature of 14.2°F (-9.9°C).Humidity
In Altoona, the average relative humidity in December is 89%.Rainfall
In Altoona, during December, the rain falls for 4.1 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, there are 128.5 rainfall days, and 26.22" (666mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 11.3 days. Throughout December, 4.69" (119mm) of snow is accumulated. Throughout the year, there are 57.9 snowfall days, and 25.87" (657mm) of snow is accumulated.Daylight
The month with the shortest days in Altoona is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:23 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:43 am and sunset at 4:35 pm CST.
Sunshine
In December, the average sunshine is 3h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Altoona. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily UV index of 1 turns into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Altoona have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Altoona, WI
- Average high temperature in December: 24.8°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (19.4°F).
- Average low temperature in December: 14.2°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure in December
Altoona, WI
- Average pressure in December: 30.1"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Altoona, WI
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
Altoona, WI
- Average humidity in December: 89%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
Altoona, WI
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in December
Altoona, WI
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (2.7 days).
Average snowfall in December
Altoona, WI
- Average snowfall in December: 4.69"
The month with the highest snowfall is February (7.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Altoona, WI
- Average snowfall days in December: 11.3 days
The month with the highest number of snowfall days is January (13.3 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, WI
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in December
Altoona, WI
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is January (17.4 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Altoona, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Altoona, WI
- Average cloud cover in December: 69
The months with the most cloud cover are January, February and December (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Altoona, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Altoona, Wisconsin, USA
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