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
December signals a considerable drop in Sumner's average high-temperature, reducing from an icy 38.1°F (3.4°C) in November to a freezing cold 23.5°F (-4.7°C). Sumner witnesses a consistent average low-temperature of 13.1°F (-10.5°C) throughout December.Humidity
In December, the average relative humidity is 90%.Rainfall
In December, the rain falls for 4.9 days. Throughout December, 1.5" (38mm) of precipitation is accumulated. In Sumner, during the entire year, the rain falls for 137.1 days and collects up to 24.72" (628mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Sumner, in December, during 17 snowfall days, 6.3" (160mm) of snow is typically accumulated. In Sumner, during the entire year, snow falls for 84.2 days and aggregates up to 30.63" (778mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:26 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:33 pm CST.
Sunshine
In Sumner, the average sunshine in December is 2.9h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 1 in December leads to these guidelines:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Sumner in December?
What is the average humidity in December in Sumner?
How many days does it rain in December in Sumner?
How many days does it snow in December in Sumner?
What is the month with the shortest days in Sumner?
How many hours of daylight does Sumner have in December?
What time are sunrise and sunset in December in Sumner?
How long on average sun shines in December in Sumner?
What are the months with the lowest UV index in Sumner?
How high is the UV index in December in Sumner?
Average temperature in December
Sumner, WI
- Average high temperature in December: 23.5°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in December: 13.1°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 (5.4°F).
Average pressure in December
Sumner, 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
Sumner, WI
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Sumner, WI
- Average humidity in December: 90%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (76%).
Average rainfall in December
Sumner, WI
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is June (3.82").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in December
Sumner, WI
- Average rainfall days in December: 4.9 days
The month with the highest number of rainy days is June (19 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in December
Sumner, WI
- Average snowfall in December: 6.3"
The month with the highest snowfall is February (6.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sumner, WI
- Average snowfall days in December: 17 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sumner, WI
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 2h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
Sumner, WI
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is October (15.9 days).
The month with the least sunshine days is June (9.4 days).
Average UV index in December
Sumner, 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 and December (UV index 1).
Average cloud cover in December
Sumner, WI
- Average cloud cover in December: 70
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Sumner, WI
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Sumner, Wisconsin, USA
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