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 shift from November to December involves a decrease in the average high-temperature, dropping from a cold 36°F (2.2°C) to a freezing cold 23.7°F (-4.6°C). Mercer's average low-temperature in the month of December is recorded at 14.4°F (-9.8°C).Humidity
In December, the average relative humidity is 91%.Rainfall
In Mercer, in December, it is raining for 4.3 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, there are 126.3 rainfall days, and 24.09" (612mm) 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 23.5 days and accumulates 10.75" (273mm) of snow.Daylight
With an average of 8h and 42min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:23 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:24 pm CST.
Sunshine
In Mercer, the average sunshine in December is 2.2h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 1 suggests these recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mercer in December?
What is the average humidity in December?
How much does it rain in December?
When does it snow the most?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Mercer have in December?
When is the sunrise / sunset in December in Mercer?
How many hours of sunshine does Mercer have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Mercer, WI
- Average high temperature in December: 23.7°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (18.3°F).
- Average low temperature in December: 14.4°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (7°F).
Average pressure in December
Mercer, WI
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Mercer, WI
- Average wind speed in December: 8.4mph
The windiest month (with the highest average wind speed) is November (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in December
Mercer, WI
- Average humidity in December: 91%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (71%).
Average rainfall in December
Mercer, WI
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days in December
Mercer, WI
- Average rainfall days in December: 4.3 days
The months with the highest number of rainy days are May and June (16 days).
The month with the least rainy days is January (3 days).
Average snowfall in December
Mercer, WI
- Average snowfall in December: 10.75"
The month with the highest snowfall is December (10.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mercer, WI
- Average snowfall days in December: 23.5 days
The month with the highest number of snowfall days is January (25.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mercer, WI
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 2h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).
Average sunshine days in December
Mercer, WI
- Average sunshine days in December: 7.2 days
The month with the most sunshine days is August (14.3 days).
The month with the least sunshine days is January (6.3 days).
Average UV index in December
Mercer, 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, March, November and December (UV index 1).
Average cloud cover in December
Mercer, WI
- Average cloud cover in December: 79
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Mercer, WI
- Average visibility in December: 4mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February and December (4mi).
Mercer, Wisconsin, USA
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