December weather forecast
Barstow, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Barstow, Illinois, with an average temperature varying between 23.9°F (-4.5°C) and 34.5°F (1.4°C).

Temperature

December comes with a drop in the average high-temperature, falling from November's chilly 46.9°F (8.3°C) to an icy 34.5°F (1.4°C). In the month of December, Barstow experiences an average low-temperature of 23.9°F (-4.5°C).

Humidity

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

Rainfall

The month with the least rainfall in Barstow is December, when the rain falls for 4.1 days and typically collects 0.35" (9mm) of precipitation.

Snowfall

Months with snowfall are January through April, September through December. In Barstow, in December, snow falls for 5 days, with typically accumulated 0.39" (10mm) of snow. Throughout the year, there are 24.5 snowfall days, and 4.09" (104mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Barstow.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:41 pm CST.

Sunshine

The average sunshine in December is 4.2h.

UV index

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests this advice:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Barstow?

December temperatures vary between a high-temperature of 34.5°F (1.4°C) and a low-temperature of 23.9°F (-4.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 86°F (30°C).

What is the average humidity in December in Barstow?

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

What is the driest month in Barstow?

December is the month with the least rainfall. Rain falls for 4.1 days and accumulates 0.35" (9mm) of precipitation.

How much does it rain in Barstow in December?

In Barstow, Illinois, in December, it is raining for 4.1 days, with typically 0.35" (9mm) of accumulated precipitation.

How much does it snow in Barstow in December?

In Barstow, Illinois, during December, snow falls for 5 days and regularly aggregates up to 0.39" (10mm) of snow.

What is the month with the shortest days in Barstow?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

What is the average length of the day in December in Barstow?

In December, the average day length in Barstow is 9h and 14min.

When is the sunrise / sunset in December in Barstow?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:41 pm CST.

How many hours of sunshine does Barstow have in December?

In December, the average sunshine duration in Barstow, Illinois, is 4.2h.

How high is the UV index in December in Barstow?

The average daily maximum UV index in December in Barstow, Illinois, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Barstow, IL

Average temperature in December - Barstow, IL
  • Average high temperature in December: 34.5°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in December: 23.9°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).

Average pressure in December
Barstow, IL

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

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Barstow, IL

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

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).

Average humidity in December
Barstow, IL

Average humidity in December - Barstow, IL
  • Average humidity in December: 81%

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

Average rainfall in December
Barstow, IL

Average rainfall in December - Barstow, IL
  • Average rainfall in December: 0.35"

The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").

Average rainfall days in December
Barstow, IL

Average rainfall days in December - Barstow, IL
  • Average rainfall days in December: 4.1 days

The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).

Average snowfall in December
Barstow, IL

Average snowfall in December - Barstow, IL
  • Average snowfall in December: 0.39"

The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").

Average snowfall days in December
Barstow, IL

Average snowfall days in December - Barstow, IL
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

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

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

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 12min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in December
Barstow, IL

Average sunshine days in December - Barstow, IL
  • Average sunshine days in December: 22.4 days

The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).

Average UV index in December
Barstow, IL

Average UV index in December - Barstow, IL
  • Average UV index in December: 2

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

Average cloud cover in December
Barstow, IL

Average cloud cover in December - Barstow, IL
  • Average cloud cover in December: 56

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in December
Barstow, IL

Average visibility in December - Barstow, 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).

Barstow, Illinois, USA

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