December weather forecast
Rochelle, IL

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Weather in December

The first month of the winter, December, is still a cold month in Rochelle, Illinois, with an average temperature ranging between max 32.9°F (0.5°C) and min 22.8°F (-5.1°C).

Temperature

Rochelle in December demonstrates a small temperature transition, adjusting from an average high of a chilly 45.3°F (7.4°C) in November to a cold 32.9°F (0.5°C). Rochelle experiences a consistent average temperature of 22.8°F (-5.1°C) throughout the nights in December.

Humidity

The average relative humidity in December is 83%.

Rainfall

In Rochelle, during December, the rain falls for 6.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Rochelle, during the entire year, the rain falls for 124.5 days and collects up to 14.49" (368mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Rochelle. In Rochelle, during December, snow falls for 7.7 days and regularly aggregates up to 0.87" (22mm) of snow. Throughout the year, there are 37.1 snowfall days, and 6.14" (156mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:35 pm CST.

Sunshine

The average sunshine in December 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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 1 during December translates into the following guidance:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Rochelle in December?

The high-temperature during December is 32.9°F (0.5°C) and the low-temperature is 22.8°F (-5.1°C).

What is the average humidity in December in Rochelle?

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

How many days does it rain in December in Rochelle?

In December, the rain falls for 6.2 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

How much does it snow in Rochelle in December?

In December, in Rochelle, it is snowing for 7.7 days. Throughout December, 0.87" (22mm) of snow is accumulated.

What is the month with the shortest days in Rochelle?

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

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

The average day length in December in Rochelle is 9h and 11min.

When is the sunrise / sunset in December in Rochelle?

On the first day of December, sunrise is at 7:05 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:35 pm CST.

How long on average sun shines in December in Rochelle?

In December, the average sunshine duration in Rochelle is 3.9h.

What is the month with the lowest UV index in Rochelle?

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

What is the UV index reading in December in Rochelle?

In December, the average daily maximum UV index is 1. A UV Index 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
Rochelle, IL

Average temperature in December - Rochelle, IL
  • Average high temperature in December: 32.9°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 (27°F).

  • Average low temperature in December: 22.8°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 (14.7°F).

Average pressure in December
Rochelle, IL

Average pressure in December - Rochelle, 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
Rochelle, IL

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

The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in December
Rochelle, IL

Average humidity in December - Rochelle, IL
  • Average humidity in December: 83%

The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (74%).

Average rainfall in December
Rochelle, IL

Average rainfall in December - Rochelle, IL
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is February (0.55").

Average rainfall days in December
Rochelle, IL

Average rainfall days in December - Rochelle, IL
  • Average rainfall days in December: 6.2 days

The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in December
Rochelle, IL

Average snowfall in December - Rochelle, IL
  • Average snowfall in December: 0.87"

The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Rochelle, IL

Average snowfall days in December - Rochelle, IL
  • Average snowfall days in December: 7.7 days

The month with the highest number of snowfall days is January (10.3 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
Rochelle, IL

Average daylight in December / Average sunshine in December - Rochelle, 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 June (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Rochelle, IL

Average sunshine days in December - Rochelle, IL
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.9 days).

Average UV index in December
Rochelle, IL

Average UV index in December - Rochelle, IL
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Rochelle, IL

Average cloud cover in December - Rochelle, IL
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).

Average visibility in December
Rochelle, IL

Average visibility in December - Rochelle, 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).

Rochelle, Illinois, USA

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