December weather forecastDecatur, MI
December
Weather in December
December, the first month of the winter in Decatur, is also a wintry month, with temperature in the range of an average low of 26.4°F (-3.1°C) and an average high of 35.2°F (1.8°C).Temperature
The arrival of December corresponds with a shift in temperature, down from a chilly 45.9°F (7.7°C) in November to a cold 35.2°F (1.8°C). During December, Decatur's nighttime temperatures demonstrate a subtle cooling from daytime highs, stabilizing at a subzero cold 26.4°F (-3.1°C).Humidity
In Decatur, the average relative humidity in December is 84%.Rainfall
In December, the rain falls for 8.1 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. Throughout the year, there are 139.4 rainfall days, and 20" (508mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Decatur, in December, during 14.4 snowfall days, 2.13" (54mm) of snow is typically accumulated. Throughout the year, there are 63 snowfall days, and 14.45" (367mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:53 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 8:12 am and sunset at 5:22 pm EST.
Sunshine
In December, the average sunshine in Decatur is 3.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Decatur. A UV Index value of 2, and less, symbolizes 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:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Decatur, MI
- Average high temperature in December: 35.2°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Decatur, MI
- Average pressure in December: 30.08"Hg
The months with the highest atmospheric pressure are January, March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Decatur, MI
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Decatur, MI
- Average humidity in December: 84%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in December
Decatur, MI
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is June (2.6").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
Decatur, MI
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in December
Decatur, MI
- Average snowfall in December: 2.13"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Decatur, MI
- Average snowfall days in December: 14.4 days
The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Decatur, MI
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 3h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in December
Decatur, MI
- Average sunshine days in December: 11.2 days
The month with the most sunshine days is March (14.4 days).
The month with the least sunshine days is January (9.8 days).
Average UV index in December
Decatur, MI
- Average UV index in December: 1
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Decatur, MI
- Average cloud cover in December: 69
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Decatur, MI
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
