December weather forecast
Stillman Valley, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Stillman Valley, Illinois, with an average temperature varying between 32.5°F (0.3°C) and 22.5°F (-5.3°C).

Temperature

December brings a drop in Stillman Valley's average high-temperature, falling from a chilly 44.8°F (7.1°C) in November to a cold 32.5°F (0.3°C). Stillman Valley witnesses an average low-temperature of 22.5°F (-5.3°C) throughout the month of December.

Humidity

In Stillman Valley, the average relative humidity in December is 83%.

Rainfall

In Stillman Valley, in December, during 4.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Stillman Valley, during the entire year, the rain falls for 100.6 days and collects up to 7.99" (203mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Stillman Valley. In Stillman Valley, in December, during 6.6 snowfall days, 0.35" (9mm) of snow is typically accumulated. In Stillman Valley, during the entire year, snow falls for 29.5 days and aggregates up to 3.66" (93mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:35 pm CST.

Sunshine

In December, the average sunshine in Stillman Valley is 3.9h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 1 during December translates into the following directions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Always opt for UVA and UVB-resistant sunglasses on radiant days. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Stillman Valley in December?

The high-temperature, in December, in Stillman Valley, is 32.5°F (0.3°C), while the low-temperature averages to 22.5°F (-5.3°C).

What is the average humidity in December in Stillman Valley?

The average relative humidity in December in Stillman Valley, Illinois, is 83%.

How many days does it rain in December in Stillman Valley?

In Stillman Valley, Illinois, in December, it is raining for 4.6 days, with typically 0.39" (10mm) of accumulated precipitation.

How much does it snow in Stillman Valley in December?

In Stillman Valley, Illinois, during December, snow falls for 6.6 days and regularly aggregates up to 0.35" (9mm) of snow.

What is the month with the shortest days in Stillman Valley?

With an average of 9h and 12min of daylight, December has the shortest days of the year in Stillman Valley, Illinois.

How many hours of daylight does Stillman Valley have in December?

The average day length in December in Stillman Valley is 9h and 10min.

What time are sunrise and sunset in December in Stillman Valley?

On the first day of December, sunrise is at 7:06 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:35 pm CST.

How long on average sun shines in December in Stillman Valley?

The average sunshine duration in December in Stillman Valley, Illinois, is 3.9h.

What is the month with the lowest UV index in Stillman Valley?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Stillman Valley?

In Stillman Valley, the average daily maximum UV index in December is 1. 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Stillman Valley, IL

Average temperature in December - Stillman Valley, IL
  • Average high temperature in December: 32.5°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in December: 22.5°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14°F).

Average pressure in December
Stillman Valley, IL

Average pressure in December - Stillman Valley, 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 (29.91"Hg).

Average wind speed in December
Stillman Valley, IL

Average wind speed in December - Stillman Valley, IL
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in December
Stillman Valley, IL

Average humidity in December - Stillman Valley, IL
  • Average humidity in December: 83%

The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).

Average rainfall in December
Stillman Valley, IL

Average rainfall in December - Stillman Valley, IL
  • Average rainfall in December: 0.39"

The wettest month (with the highest rainfall) is May (1.18").
The driest months (with the least rainfall) are January and February (0.35").

Average rainfall days in December
Stillman Valley, IL

Average rainfall days in December - Stillman Valley, IL
  • Average rainfall days in December: 4.6 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (3.2 days).

Average snowfall in December
Stillman Valley, IL

Average snowfall in December - Stillman Valley, IL
  • Average snowfall in December: 0.35"

The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Stillman Valley, IL

Average snowfall days in December - Stillman Valley, IL
  • Average snowfall days in December: 6.6 days

The month with the highest number of snowfall days is January (8.1 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
Stillman Valley, IL

Average daylight in December / Average sunshine in December - Stillman Valley, IL
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in December
Stillman Valley, IL

Average sunshine days in December - Stillman Valley, IL
  • Average sunshine days in December: 22.6 days

The month with the most sunshine days is December (22.6 days).
The month with the least sunshine days is June (12.8 days).

Average UV index in December
Stillman Valley, IL

Average UV index in December - Stillman Valley, IL
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Stillman Valley, IL

Average cloud cover in December - Stillman Valley, IL
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 33).

Average visibility in December
Stillman Valley, IL

Average visibility in December - Stillman Valley, IL
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

Stillman Valley, Illinois, USA

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