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
A change in temperatures is noted as November gives way to December, with average highs reducing from a frosty 45.9°F (7.7°C) to a wintry 35.2°F (1.8°C). During the nights of December, Decatur records an average low-temperature of 26.4°F (-3.1°C), reflecting a modest decrease from daytime highs.Humidity
In December, the average relative humidity is 84%.Rainfall
In Decatur, during December, the rain falls for 8.1 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Decatur, during the entire year, the rain falls for 139.4 days and collects up to 20" (508mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Decatur. In Decatur, in December, snow falls for 14.4 days, with typically accumulated 2.13" (54mm) of snow. 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 in Decatur.On the first day of December in Decatur, Michigan, 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 Decatur, Michigan, the average sunshine in December is 3.1h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 1 during December translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Decatur in December?
What is the average humidity in December in Decatur?
How many days does it rain in December in Decatur?
How much does it snow in Decatur in December?
What is the month with the shortest days in Decatur?
How many hours of daylight does Decatur have in December?
When is the sunrise / sunset in December in Decatur?
How many hours of sunshine does Decatur have in December?
When is the lowest UV index in Decatur?
How high is the UV index in December in Decatur?
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 1min
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 1min
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).
Decatur, Michigan, USA
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