December weather forecast
Symerton, IL

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Weather in December

December, the first month of the winter in Symerton, is still a cold month, with an average temperature varying between 25.5°F (-3.6°C) and 35.6°F (2°C).

Temperature

December indicates a shift in the average high-temperature, from November's frosty 47.3°F (8.5°C) to a wintry 35.6°F (2°C). Symerton observes an average nighttime temperature of 25.5°F (-3.6°C) during December.

Humidity

In Symerton, the average relative humidity in December is 81%.

Rainfall

In Symerton, in December, during 8.7 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Symerton, Illinois, during the entire year, the rain falls for 160.4 days and collects up to 33.5" (851mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 8.5 days. Throughout December, 2.44" (62mm) of snow is accumulated. Throughout the year, there are 38.7 snowfall days, and 15.39" (391mm) 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 6:59 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:33 pm CST.

Sunshine

In December, the average sunshine is 4.3h.

UV index

The month with the lowest UV index is December, 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 radiation for ordinary individuals.
Note: In December, the maximum UV index of 1 translates into these guidelines:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Updated: Jun 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In Symerton, in December, the average high-temperature is 35.6°F (2°C), and the average low-temperature is 25.5°F (-3.6°C). In July, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is estimated at 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December in Symerton is 81%.

How much does it rain in December?

In December, the rain falls for 8.7 days. Throughout December, 1.81" (46mm) of precipitation is accumulated.

How much does it snow in December?

In Symerton, Illinois, in December, snow falls for 8.5 days, with typically accumulated 2.44" (62mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 15min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:33 pm CST.

How many hours of sunshine does Symerton have in December?

In Symerton, the average sunshine duration in December is 4.3h.

When is the lowest UV index?

December is the month with the lowest UV index in Symerton, with an average maximum UV index of 1.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Symerton, IL

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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