December weather forecast
Saint David, IL

Weather in December

The first month of the winter, December, is still a cold month in Saint David, Illinois, with an average temperature fluctuating between 26.4°F (-3.1°C) and 37°F (2.8°C).

Temperature

In Saint David, the average high-temperature in December drops from a frosty 49.1°F (9.5°C) in November to a cold 37°F (2.8°C). In Saint David, Illinois, the average low-temperature is 26.4°F (-3.1°C).

Humidity

In Saint David, the average relative humidity in December is 79%.

Rainfall

The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 0.94" (24mm) of precipitation.

Snowfall

Months with snowfall in Saint David are January through April, October through December. In Saint David, during 5 snowfall days, 1.1" (28mm) of snow is typically accumulated. Throughout the year, there are 27.4 snowfall days, and 9.21" (234mm) of snow is accumulated.

Daylight

With an average of 9h and 20min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:34 pm. On the last day of December, in Saint David, Illinois, sunrise is at 7:23 am and sunset at 4:43 pm CST.

Sunshine

In December, the average sunshine in Saint David, Illinois, is 4.5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. 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: The average daily UV index of 2 in December transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Saint David?

The average high-temperature, in December, in Saint David, is 37°F (2.8°C), while the average low-temperature is 26.4°F (-3.1°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in December in Saint David?

In December, the average relative humidity in Saint David is 79%.

What is the driest month in Saint David?

December is the month with the least rainfall in Saint David, Illinois. Rain falls for 6.5 days and accumulates 0.94" (24mm) of precipitation.

How many days does it rain in December in Saint David?

In Saint David, in December, during 6.5 rainfall days, 0.94" (24mm) of precipitation is typically accumulated.

How many days does it snow in December in Saint David?

In December, in Saint David, Illinois, it is snowing for 5 days. Throughout December, 1.1" (28mm) of snow is accumulated.

What is the month with the shortest days in Saint David?

The month with the shortest days in Saint David is December, with an average of 9h and 20min of daylight.

How many hours of daylight does Saint David have in December?

In Saint David, Illinois, the average day length in December is 9h and 20min.

When is the sunrise / sunset in December in Saint David?

On the first day of December in Saint David, sunrise is at 7:04 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:43 pm CST.

How many hours of sunshine does Saint David have in December?

The average sunshine duration in December is 4.5h.

What are the months with the lowest UV index in Saint David?

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

What is the UV index reading in December in Saint David?

The average daily maximum UV index in December in Saint David, Illinois, is 2. A UV Index reading of 2, and below, represents 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
Saint David, IL

Average temperature in December - Saint David, IL
  • Average high temperature in December: 37°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in December: 26.4°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).

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Average pressure in December
Saint David, IL

Average pressure in December - Saint David, IL
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Saint David, IL

Average wind speed in December - Saint David, IL
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in December
Saint David, IL

Average humidity in December - Saint David, IL
  • Average humidity in December: 79%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in December
Saint David, IL

Average rainfall in December - Saint David, IL
  • Average rainfall in December: 0.94"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").

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Average rainfall days in December
Saint David, IL

Average rainfall days in December - Saint David, IL
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).

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Average snowfall in December
Saint David, IL

Average snowfall in December - Saint David, IL
  • Average snowfall in December: 1.1"

The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Saint David, IL

Average snowfall days in December - Saint David, IL
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (9.4 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
Saint David, IL

Average daylight in December / Average sunshine in December - Saint David, IL
  • Average daylight in December: 9h and 20min

The month with the longest days is June (Average daylight: 15h and 1min).
The month with the shortest days is December (Average daylight: 9h and 20min).

  • Average sunshine in December: 4h and 30min

The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in December
Saint David, IL

Average sunshine days in December - Saint David, IL
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in December
Saint David, IL

Average UV index in December - Saint David, 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).

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Average cloud cover in December
Saint David, IL

Average cloud cover in December - Saint David, IL
  • Average cloud cover in December: 52

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in December
Saint David, IL

Average visibility in December - Saint David, 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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