December weather forecast
Simpson, IL

Weather in December

The first month of the winter, December, is also a frosty month in Simpson, Illinois, with an average temperature fluctuating between 44.8°F (7.1°C) and 32.7°F (0.4°C).

Temperature

In Simpson, the average high-temperature in December drops from a cool 54.5°F (12.5°C) in November to a chilly 44.8°F (7.1°C). The average low-temperature, in December, is 32.7°F (0.4°C).

Humidity

In Simpson, Illinois, the average relative humidity in December is 78%.

Rainfall

In Simpson, Illinois, during December, the rain falls for 7.3 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Simpson, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.

Snowfall

Months with snowfall in Simpson, Illinois, are January through March, November and December. In Simpson, during December, snow falls for 1.9 days and regularly aggregates up to 0.12" (3mm) of snow. Throughout the year, there are 11 snowfall days, and 1.57" (40mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 38min of daylight.
On the first day of the month, sunrise is at 6:50 am and sunset at 4:37 pm. On the last day of December, in Simpson, sunrise is at 7:09 am and sunset at 4:46 pm CST.

Sunshine

In Simpson, Illinois, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index in Simpson, Illinois, are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Simpson?

In December, the average high-temperature is 44.8°F (7.1°C), and the average low-temperature is 32.7°F (0.4°C). in September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is appraised at 86°F (30°C).

What is the average humidity in December in Simpson?

The average relative humidity in December is 78%.

How much does it rain in Simpson in December?

In Simpson, in December, during 7.3 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How many days does it snow in December in Simpson?

In Simpson, Illinois, during December, snow falls for 1.9 days and regularly aggregates up to 0.12" (3mm) of snow.

What is the month with the shortest days in Simpson?

With an average of 9h and 38min of daylight, December has the shortest days of the year in Simpson.

How many hours of daylight does Simpson have in December?

In Simpson, Illinois, the average day length in December is 9h and 38min.

When is the sunrise / sunset in December in Simpson?

In December, on the first day of the month, sunrise is at 6:50 am and sunset at 4:37 pm. On the last day of the month, in Simpson, sunrise is at 7:09 am and sunset at 4:46 pm CST.

How long on average sun shines in December in Simpson?

In Simpson, the average sunshine duration in December is 4.8h.

What are the months with the lowest UV index in Simpson?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December in Simpson?

In Simpson, Illinois, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Simpson, IL

Average temperature in December - Simpson, IL
  • Average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 32.7°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°F).

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Average pressure in December
Simpson, IL

Average pressure in December - Simpson, IL
  • 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 (29.94"Hg).

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Average wind speed in December
Simpson, IL

Average wind speed in December - Simpson, IL
  • Average wind speed in December: 8.5mph

The windiest months (with the highest average wind speed) are January and February (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in December
Simpson, IL

Average humidity in December - Simpson, IL
  • Average humidity in December: 78%

The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in December
Simpson, IL

Average rainfall in December - Simpson, IL
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

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Average rainfall days in December
Simpson, IL

Average rainfall days in December - Simpson, IL
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

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Average snowfall in December
Simpson, IL

Average snowfall in December - Simpson, IL
  • Average snowfall in December: 0.12"

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Simpson, IL

Average snowfall days in December - Simpson, IL
  • Average snowfall days in December: 1.9 days

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Simpson, IL

Average daylight in December / Average sunshine in December - Simpson, IL
  • Average daylight in December: 9h and 38min

The month with the longest days is June (Average daylight: 14h and 43min).
The month with the shortest days is December (Average daylight: 9h and 38min).

  • Average sunshine in December: 4h and 48min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Simpson, IL

Average sunshine days in December - Simpson, IL
  • Average sunshine days in December: 21.2 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

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Average UV index in December
Simpson, IL

Average UV index in December - Simpson, IL
  • 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).

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Average cloud cover in December
Simpson, IL

Average cloud cover in December - Simpson, IL
  • Average cloud cover in December: 49

The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

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Average visibility in December
Simpson, IL

Average visibility in December - Simpson, 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).

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