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
December brings a decrease in the average high-temperature, shifting from a frosty 47.5°F (8.6°C) in November to a wintry 36.7°F (2.6°C). December nights in Decatur, Indiana, are marked by an average low-temperature of 27.1°F (-2.7°C).Humidity
In Decatur, the average relative humidity in December is 82%.Rainfall
In Decatur, in December, during 11.1 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, in Decatur, there are 159.4 rainfall days, and 23.74" (603mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 10 days. Throughout December, 1.93" (49mm) of snow is accumulated. Throughout the year, there are 48.4 snowfall days, and 10.47" (266mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:45 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 5:22 pm EST.
Sunshine
In December, the average sunshine in Decatur, Indiana, is 3.9h.UV index
December is the month with the lowest UV index, 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 rays for the ordinary person.Note: In December, a daily UV index of 1 turns into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
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?
What is the UV index reading in December in Decatur?
Average temperature in December
Decatur, IN
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Decatur, IN
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Decatur, IN
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Decatur, IN
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Decatur, IN
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in December
Decatur, IN
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in December
Decatur, IN
- Average snowfall in December: 1.93"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Decatur, IN
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (13.5 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, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Decatur, IN
- Average sunshine days in December: 13 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Decatur, IN
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Decatur, IN
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Decatur, IN
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Decatur, Indiana, USA
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