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
The onset of December is marked by a decrease in temperature, transitioning from a fresh 54.5°F (12.5°C) in November to a chilly 45.5°F (7.5°C). During December, the average low-temperature is a cold 33.4°F (0.8°C).Humidity
In Mattoon, the average relative humidity in December is 78%.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 2.05" (52mm) of precipitation is accumulated. In Mattoon, Kentucky, during the entire year, the rain falls for 148.8 days and collects up to 27.05" (687mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Mattoon, in December, during 3.2 snowfall days, 0.51" (13mm) of snow is typically accumulated. Throughout the year, there are 15 snowfall days, and 4.8" (122mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 6:48 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:06 am and sunset at 4:44 pm CST.
Sunshine
The average sunshine in December is 4.8h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Mattoon. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 2 during December translates into the following guidance:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Frequently asked questions
What is the usual temperature for Mattoon in December?
What is the average humidity in December in Mattoon?
How much does it rain in Mattoon in December?
How many days does it snow in December in Mattoon?
What is the month with the shortest days in Mattoon?
What is the average length of the day in December in Mattoon?
When are sunrise and sunset in December in Mattoon?
How many hours of sunshine does Mattoon have in December?
When is the lowest UV index in Mattoon?
What is the UV index reading in December in Mattoon?
Average temperature in December
Mattoon, KY
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in December: 33.4°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).
Average pressure in December
Mattoon, KY
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Mattoon, KY
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Mattoon, KY
- Average humidity in December: 78%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mattoon, KY
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is February (3.03").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in December
Mattoon, KY
- Average rainfall days in December: 10.8 days
The months with the highest number of rainy days are May and July (16.3 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in December
Mattoon, KY
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mattoon, KY
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mattoon, KY
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Mattoon, KY
- Average sunshine days in December: 18.2 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is July (12.1 days).
Average UV index in December
Mattoon, KY
- 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, February and December (UV index 2).
Average cloud cover in December
Mattoon, KY
- Average cloud cover in December: 49
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility in December
Mattoon, KY
- 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).
Mattoon, Kentucky, USA
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