December weather forecastCuster, WI
December
Weather in December
December, the first month of the winter in Custer, is still a freezing cold month, with an average temperature fluctuating between 16.5°F (-8.6°C) and 25.9°F (-3.4°C).Temperature
December weather is marked by a drop in the average high-temperature, falling from an icy 39.2°F (4°C) in November to a freezing cold 25.9°F (-3.4°C). An average nighttime temperature of 16.5°F (-8.6°C) is observed during December.Humidity
In Custer, Wisconsin, the average relative humidity in December is 88%.Rainfall
In Custer, in December, during 4.6 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, there are 123.2 rainfall days, and 23.54" (598mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall. Snow falls for 12.9 days and accumulates 5.2" (132mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:14 am and sunset at 4:19 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:28 pm CST.
Sunshine
The average sunshine in December in Custer is 3.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Custer, WI
- Average high temperature in December: 25.9°F
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (20.5°F).
- Average low temperature in December: 16.5°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 (9°F).
Average pressure in December
Custer, WI
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Custer, WI
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (7.2mph).
Average humidity in December
Custer, WI
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Custer, WI
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is June (3.23").
The driest month (with the least rainfall) is February (0.91").
Average rainfall days in December
Custer, WI
- Average rainfall days in December: 4.6 days
The month with the highest number of rainy days is May (16.1 days).
The month with the least rainy days is January (2.8 days).
Average snowfall in December
Custer, WI
- Average snowfall in December: 5.2"
The month with the highest snowfall is December (5.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Custer, WI
- Average snowfall days in December: 12.9 days
The month with the highest number of snowfall days is January (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Custer, WI
- Average daylight in December: 8h and 54min
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 6min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
Custer, WI
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is November (17 days).
The months with the least sunshine days are April, May and June (12.7 days).
Average UV index in December
Custer, WI
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Custer, WI
- Average cloud cover in December: 68
The month with the most cloud cover is January (Cloud cover 70).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Custer, WI
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).
