December weather forecastDecatur, AL
December
Weather in December
December in Decatur kicks off the winter season, displaying temperatures from 38.3°F (3.5°C) to 51.6°F (10.9°C), solidifying the departure from the milder conditions in November. The city sees a revival of snowfall, although light, it still ushering the joyous period of Christmas celebrations. The atmosphere becomes more humid than the previous month. The shortened day length ensures longer winter nights. The increase in wind speed signals the winter's settlement and paints a perfect winter scene with a light dusting of snow.Temperature
The arrival of December is marked by a minor reduction in average high-temperature, sliding from a refreshing 59.5°F (15.3°C) in November to a cool 51.6°F (10.9°C). Throughout December, the average low-temperature dips to an icy 38.3°F (3.5°C).Humidity
With an average relative humidity of 79%, December is the most humid month.Rainfall
December is the month with the most rainfall in Decatur. Rain falls for 13.3 days and accumulates 4.45" (113mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Decatur, in December, snow falls for 1.5 days, with typically accumulated 0.35" (9mm) of snow. Throughout the year, in Decatur, there are 7.4 snowfall days, and 1.77" (45mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:37 am and sunset at 4:37 pm. On the last day of December, sunrise is at 6:54 am and sunset at 4:47 pm CST.
Sunshine
The average sunshine in December in Decatur is 4.8h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Decatur, AL
- Average high temperature in December: 51.6°F
The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (47.5°F).
- Average low temperature in December: 38.3°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).
Average pressure in December
Decatur, AL
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in December
Decatur, AL
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).
Average humidity in December
Decatur, AL
- Average humidity in December: 79%
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Decatur, AL
- Average rainfall in December: 4.45"
The wettest month (with the highest rainfall) is December (4.45").
The driest months (with the least rainfall) are September and November (2.48").
Average rainfall days in December
Decatur, AL
- Average rainfall days in December: 13.3 days
The month with the highest number of rainy days is July (20 days).
The month with the least rainy days is November (10.4 days).
Average snowfall in December
Decatur, AL
- Average snowfall in December: 0.35"
The months with the highest snowfall are January and February (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Decatur, AL
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Decatur, AL
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Decatur, AL
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (8.8 days).
Average UV index in December
Decatur, AL
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Decatur, AL
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Decatur, AL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
