December weather forecast
Vernon, IL

Share

Weather in December

The first month of the winter, December, is also an icy month in Vernon, Illinois, with temperature in the range of an average high of 41.9°F (5.5°C) and an average low of 30.6°F (-0.8°C).

Temperature

December's arrival corresponds with a decrease in average high-temperatures, from November's fresh 52.2°F (11.2°C) to a wintry 41.9°F (5.5°C). An average minimum temperature of 30.6°F (-0.8°C) marks the month of December.

Humidity

The average relative humidity in December is 78%.

Rainfall

In Vernon, in December, it is raining for 8.7 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, in Vernon, there are 145.5 rainfall days, and 28.39" (721mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Vernon, in December, during 3.6 snowfall days, 1.06" (27mm) of snow is typically accumulated. Throughout the year, in Vernon, there are 17.7 snowfall days, and 5.91" (150mm) of snow is accumulated.

Daylight

The month with the shortest days in Vernon is December, with an average of 9h and 30min of daylight.
On the first day of December in Vernon, Illinois, sunrise is at 6:56 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:44 pm CST.

Sunshine

In Vernon, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index in Vernon are January, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Stay sun-safe with clothing that is both closely woven and worn loosely. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
[Resources]

Frequently asked questions

How cold is December in Vernon?

In December, the average high-temperature and low-temperature are 41.9°F (5.5°C) and 30.6°F (-0.8°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is appraised at 93.2°F (34°C).

What is the average humidity in December in Vernon?

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

How many days does it rain in December in Vernon?

In December, in Vernon, Illinois, the rain falls for 8.7 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

How many days does it snow in December in Vernon?

In Vernon, in December, snow falls for 3.6 days, with typically accumulated 1.06" (27mm) of snow.

What is the month with the shortest days in Vernon?

With an average of 9h and 30min of daylight, December has the shortest days of the year in Vernon, Illinois.

How many hours of daylight does Vernon have in December?

In December, the average day length in Vernon, Illinois, is 9h and 30min.

When are sunrise and sunset in December in Vernon?

On the first day of December in Vernon, sunrise is at 6:56 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:44 pm CST.

How long on average sun shines in December in Vernon?

The average sunshine duration in December in Vernon, Illinois, is 4.8h.

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

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

What is the UV index intensity in December in Vernon?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
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
Vernon, IL

Average temperature in December - Vernon, IL
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 30.6°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

[Resources]

Average pressure in December
Vernon, IL

Average pressure in December - Vernon, 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).

[Resources]

Average wind speed in December
Vernon, IL

Average wind speed in December - Vernon, IL
  • Average wind speed in December: 9.2mph

The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).

[Resources]

Average humidity in December
Vernon, IL

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

The months with the highest relative humidity are May, July and August (80%).
The month with the lowest relative humidity is October (71%).

[Resources]

Average rainfall in December
Vernon, IL

Average rainfall in December - Vernon, IL
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.46").

[Resources]

Average rainfall days in December
Vernon, IL

Average rainfall days in December - Vernon, IL
  • Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (7.2 days).

[Resources]

Average snowfall in December
Vernon, IL

Average snowfall in December - Vernon, IL
  • Average snowfall in December: 1.06"

The month with the highest snowfall is January (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days in December
Vernon, IL

Average snowfall days in December - Vernon, IL
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Vernon, IL
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 4h and 5min

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 30min).

[Resources]

Average sunshine days in December
Vernon, IL

Average sunshine days in December - Vernon, IL
  • Average sunshine days in December: 19.1 days

The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (11.5 days).

[Resources]

Average UV index in December
Vernon, IL

Average UV index in December - Vernon, 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, November and December (UV index 2).

[Resources]

Average cloud cover in December
Vernon, IL

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

The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).

[Resources]

Average visibility in December
Vernon, IL

Average visibility in December - Vernon, 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).

[Resources]

Vernon, Illinois, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location