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
As November transitions to December, the average high-temperature falls from a frosty 47.3°F (8.5°C) to a cold 35.6°F (2°C). In Symerton, the December nights cool down to an average low of 25.5°F (-3.6°C).Humidity
In December, the average relative humidity is 81%.Rainfall
In Symerton, during December, the rain falls for 8.7 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Symerton, during the entire year, the rain falls for 160.4 days and collects up to 33.5" (851mm) of precipitation.Snowfall
Months with snowfall in Symerton, Illinois, are January through April, October through December. In Symerton, in December, during 8.5 snowfall days, 2.44" (62mm) of snow is typically accumulated. Throughout the year, there are 38.7 snowfall days, and 15.39" (391mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 4:23 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:33 pm CST.
Sunshine
In December, the average sunshine is 4.3h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Symerton. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, a regular UV index of 1 translates into these guidelines:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
How cold is it in Symerton in December?
What is the average humidity in December in Symerton?
How many days does it rain in December in Symerton?
How many days does it snow in December in Symerton?
What is the month with the shortest days in Symerton?
How many hours of daylight does Symerton have in December?
When are sunrise and sunset in December in Symerton?
How many hours of sunshine does Symerton have in December?
What is the month with the lowest UV index in Symerton?
What is the UV index intensity in December in Symerton?
Average temperature in December
Symerton, IL
- Average high temperature in December: 35.6°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 (29.7°F).
- Average low temperature in December: 25.5°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in December
Symerton, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Symerton, IL
- Average wind speed in December: 9.3mph
The windiest months (with the highest average wind speed) are January and April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Symerton, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Symerton, IL
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is May (4.57").
The driest months (with the least rainfall) are February and November (1.69").
Average rainfall days in December
Symerton, IL
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is May (19.2 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in December
Symerton, IL
- Average snowfall in December: 2.44"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Symerton, IL
- Average snowfall days in December: 8.5 days
The month with the highest number of snowfall days is January (10.6 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
Symerton, IL
- 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: 4h and 2min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Symerton, IL
- Average sunshine days in December: 16 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in December
Symerton, IL
- 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
Symerton, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in December
Symerton, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are February, July and August (5mi).
Symerton, Illinois, USA
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