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
In December, the average high-temperature decreases from a frosty 43.9°F (6.6°C) in November to an icy 32.9°F (0.5°C). December nighttime temperatures hover close to the daytime peak with an average of 23.9°F (-4.5°C).Humidity
The average relative humidity in December is 85%.Rainfall
In Sumner, during December, the rain falls for 8 days and regularly aggregates up to 1.38" (35mm) of precipitation. In Sumner, during the entire year, the rain falls for 141.3 days and collects up to 22.48" (571mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Sumner, during December, snow falls for 14.5 days and regularly aggregates up to 3.62" (92mm) of snow. Throughout the year, there are 65.5 snowfall days, and 19.65" (499mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:52 am and sunset at 5:04 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 5:13 pm EST.
Sunshine
In Sumner, the average sunshine in December is 3.2h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 1 during December translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
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?
How many hours of daylight does Sumner have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Sumner have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Sumner, MI
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in December
Sumner, MI
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Sumner, MI
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Sumner, MI
- Average humidity in December: 85%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Sumner, MI
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in December
Sumner, MI
- Average rainfall days in December: 8 days
The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Sumner, MI
- Average snowfall in December: 3.62"
The month with the highest snowfall is January (5.91").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Sumner, MI
- Average snowfall days in December: 14.5 days
The month with the highest number of snowfall days is January (18 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, MI
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in December
Sumner, MI
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is September (15.8 days).
The month with the least sunshine days is January (10.3 days).
Average UV index in December
Sumner, MI
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Sumner, MI
- Average cloud cover in December: 67
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Sumner, MI
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, October and November (6mi).
The months with the lowest visibility are January, February, September and December (5mi).
Sumner, Michigan, USA
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