December weather forecast
Normal, IL

Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
°Celsius°Fahrenheit
Share

Contents

Weather in December

December in Normal signals the full swing of winter, as evidenced by plummeting temperatures and increased snowfall of 1.65" (42mm). This period is characterized by shorter days and longer nights, typical of the winter months. December's lower temperature, along with increased snowfall, makes way for a host of winter recreational opportunities. The combination of cool, snowy weather and festive season gives December a unique allure, rounding off the year perfectly for residents of Normal.

Temperature

December comes with a drop in the average high-temperature, falling from November's frosty 47.7°F (8.7°C) to a cold 36.5°F (2.5°C). Normal observes an average nighttime temperature of 26.2°F (-3.2°C) during December.

Humidity

In December, the average relative humidity is 80%.

Rainfall

In Normal, in December, it is raining for 7.1 days, with typically 1.22" (31mm) of accumulated precipitation. In Normal, during the entire year, the rain falls for 140.6 days and collects up to 22.44" (570mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Normal. In Normal, in December, during 8 snowfall days, 1.65" (42mm) of snow is typically accumulated. Throughout the year, there are 35.4 snowfall days, and 9.45" (240mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:39 pm CST.

Sunshine

The average sunshine in December is 4.1h.

UV index

The months with the lowest UV index in Normal are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, a daily UV index of 2 turns into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Enhance your sun protection with tightly woven, yet airy clothing. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
[Resources]

Frequently asked questions

How cold is December in Normal?

The average high-temperature, in December, in Normal, is 36.5°F (2.5°C), while the average low-temperature is 26.2°F (-3.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 86°F (30°C).

What is the average humidity in December in Normal?

In Normal, the average relative humidity in December is 80%.

How much does it rain in Normal in December?

In Normal, in December, during 7.1 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

How many days does it snow in December in Normal?

In Normal, Illinois, in December, snow falls for 8 days, with typically accumulated 1.65" (42mm) of snow.

What is the month with the shortest days in Normal?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Normal.

How many hours of daylight does Normal have in December?

In December, the average day length in Normal is 9h and 20min.

When are sunrise and sunset in December in Normal?

On the first day of December in Normal, Illinois, sunrise is at 7:00 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:39 pm CST.

How many hours of sunshine does Normal have in December?

In December, the average sunshine duration in Normal is 4.1h.

When is the lowest UV index in Normal?

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

What is the UV index reading in December in Normal?

In Normal, Illinois, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
47.7°F 8.7°C
36.5°F 2.5°C
30.7°F -0.7°C
Average low temperature
34.7°F 1.5°C
26.2°F -3.2°C
18.9°F -7.3°C
Average pressure
30.11" 765mmHg
30.11" 765mmHg
30.14" 766mmHg
Average wind speed
10.6mph 17.1km/h
10.5mph 16.9km/h
11.1mph 17.9km/h
Average max. wind speed
11.4mph 18.3km/h
11.2mph 18km/h
11.8mph 19km/h
Average wind speed gusts
16.7mph 26.9km/h
16.3mph 26.2km/h
17mph 27.4km/h
Average humidity
74%
80%
81%
Average rainfall
1.42" 36mm
1.22" 31mm
1.18" 30mm
Average rainfall days
8.5
7.1
5.6
Average snowfall
1.18" 30mm
1.65" 42mm
2.44" 62mm
Average snowfall days
2.6
8
11.5
Average daylight
9h 5min
9h 2min
9h 4min
Average sunshine
5h 1min
4h 1min
3h 4min
Average sunshine days
18.4
16.6
14.8
Average UV index
2
2
2
Average cloud cover
43%
56%
61%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Normal, IL

Average temperature in December - Normal, IL
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in December: 26.2°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

[Resources]

Average pressure in December
Normal, IL

Average pressure in December - Normal, 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 (29.92"Hg).

[Resources]

Average wind speed in December
Normal, IL

Average wind speed in December - Normal, IL
  • Average wind speed in December: 10.5mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

[Resources]

Average humidity in December
Normal, IL

Average humidity in December - Normal, IL
  • Average humidity in December: 80%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).

[Resources]

Average rainfall in December
Normal, IL

Average rainfall in December - Normal, IL
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is January (1.18").

[Resources]

Average rainfall days in December
Normal, IL

Average rainfall days in December - Normal, IL
  • Average rainfall days in December: 7.1 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.3 days).

[Resources]

Average snowfall in December
Normal, IL

Average snowfall in December - Normal, IL
  • Average snowfall in December: 1.65"

The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in December
Normal, IL

Average snowfall days in December - Normal, IL
  • Average snowfall days in December: 8 days

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

[Resources]

Average sunshine days in December
Normal, IL

Average sunshine days in December - Normal, IL
  • Average sunshine days in December: 16.6 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (9.7 days).

[Resources]

Average UV index in December
Normal, IL

Average UV index in December - Normal, 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).

[Resources]

Average cloud cover in December
Normal, IL

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

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 33).

[Resources]

Average visibility in December
Normal, IL

Average visibility in December - Normal, IL
  • Average visibility in December: 6mi

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

[Resources]

Normal, Illinois, USA

Weather forecast for today
Weather forecast for tomorrow
10 days weather forecast
Climate data
1January
2February
3March
4April
5May
6June
7July
8August
9September
10October
11November
12December

Weather forecast for your location

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