December weather forecast
Baylis, IL

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Weather in December

The first month of the winter, December, is also an icy month in Baylis, Illinois, with temperature in the range of an average high of 39°F (3.9°C) and an average low of 27.9°F (-2.3°C).

Temperature

With December's arrival, Baylis sees a decrease in average high-temperatures, moving from a fresh 50.9°F (10.5°C) in November to a cold 39°F (3.9°C). In the month of December, the average low-temperature usually rests at a subzero cold 27.9°F (-2.3°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In December, the rain falls for 7 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. In Baylis, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Baylis, in December, during 4.2 snowfall days, 0.79" (20mm) of snow is typically accumulated. Throughout the year, there are 21.9 snowfall days, and 5.67" (144mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year in Baylis.
On the first day of December, sunrise is at 7:06 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:49 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

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 estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Enhance your sun protection with tightly woven, yet airy clothing. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The average high-temperature, in December, in Baylis, is 39°F (3.9°C), while the average low-temperature is 27.9°F (-2.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 91.4°F (33°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In Baylis, in December, it is raining for 7 days, with typically 0.87" (22mm) of accumulated precipitation.

How many days does it snow in December?

In Baylis, in December, during 4.2 snowfall days, 0.79" (20mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

How many hours of daylight does Baylis have in December?

The average day length in December is 9h and 25min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:06 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:49 pm CST.

How long on average sun shines in December?

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

What are the months with the lowest UV index?

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

What is the UV index reading in December?

In Baylis, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes 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
Baylis, IL

Average temperature in December - Baylis, IL
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Baylis, IL

Average pressure in December - Baylis, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Baylis, IL

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

The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in December
Baylis, IL

Average humidity in December - Baylis, IL
  • Average humidity in December: 77%

The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Baylis, IL

Average rainfall in December - Baylis, IL
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
Baylis, IL

Average rainfall days in December - Baylis, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Baylis, IL

Average snowfall in December - Baylis, IL
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Baylis, IL

Average snowfall days in December - Baylis, IL
  • Average snowfall days in December: 4.2 days

The month with the highest number of snowfall days is January (6.3 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
Baylis, IL

Average daylight in December / Average sunshine in December - Baylis, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in December
Baylis, IL

Average sunshine days in December - Baylis, IL
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in December
Baylis, IL

Average UV index in December - Baylis, 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).

Average cloud cover in December
Baylis, IL

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

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in December
Baylis, IL

Average visibility in December - Baylis, 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).

Baylis, Illinois, USA

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