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 arrival of December corresponds with a reduction in the average high-temperature, down from November's fresh 51.1°F (10.6°C) to an icy 40.3°F (4.6°C). December is noted for a mean low-temperature of 29.1°F (-1.6°C).Humidity
In December, the average relative humidity in Effingham is 79%.Rainfall
In December, the rain falls for 8.6 days. Throughout December, 1.42" (36mm) of precipitation is accumulated. Throughout the year, in Effingham, there are 135.9 rainfall days, and 21.89" (556mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Effingham, in December, during 3.5 snowfall days, 1.14" (29mm) of snow is typically accumulated. Throughout the year, in Effingham, there are 17.7 snowfall days, and 4.17" (106mm) of snow is accumulated.Daylight
The month with the shortest days in Effingham, Illinois, is December, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 6:55 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:41 pm CST.
Sunshine
The average sunshine in December in Effingham is 4.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Effingham. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Effingham in December?
What is the average humidity in December in Effingham?
How much does it rain in Effingham in December?
How much does it snow in Effingham in December?
What is the month with the shortest days in Effingham?
How many hours of daylight does Effingham have in December?
What time are sunrise and sunset in December in Effingham?
How many hours of sunshine does Effingham have in December?
What are the months with the lowest UV index in Effingham?
How high is the UV index in December in Effingham?
Average temperature in December
Effingham, IL
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in December
Effingham, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Effingham, IL
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Effingham, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Effingham, IL
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is April (2.83").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days in December
Effingham, IL
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (6.9 days).
Average snowfall in December
Effingham, IL
- Average snowfall in December: 1.14"
The month with the highest snowfall is January (1.18").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Effingham, IL
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is February (5.3 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
Effingham, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Effingham, IL
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in December
Effingham, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Effingham, IL
- Average cloud cover in December: 51
The months with the most cloud cover are January and February (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in December
Effingham, IL
- 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).
Effingham, Illinois, USA
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