December weather forecast
Delavan, IL

Share

Weather in December

December, the first month of the winter in Delavan, is also a wintry month, with temperature in the range of an average low of 26.4°F (-3.1°C) and an average high of 36.9°F (2.7°C).

Temperature

The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 48.9°F (9.4°C) to an icy 36.9°F (2.7°C). Delavan's average low-temperature in the month of December is recorded at a subzero cold 26.4°F (-3.1°C).

Humidity

The average relative humidity in December is 79%.

Rainfall

In December, the rain falls for 6.6 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. In Delavan, during the entire year, the rain falls for 131.4 days and collects up to 20.08" (510mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Delavan, in December, snow falls for 5.4 days, with typically accumulated 1.22" (31mm) of snow. Throughout the year, there are 25.8 snowfall days, and 8.66" (220mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:42 pm CST.

Sunshine

The average sunshine in December is 4.4h.

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 value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In December, a daily UV index of 2 turns into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The high-temperature during December is 36.9°F (2.7°C) and the low-temperature is 26.4°F (-3.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

How much does it rain in December?

In Delavan, in December, it is raining for 6.6 days, with typically 1.06" (27mm) of accumulated precipitation.

How many days does it snow in December?

In December, it is snowing for 5.4 days. Throughout December, 1.22" (31mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 9h and 21min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:42 pm CST.

How many hours of sunshine does Delavan have in December?

The average sunshine duration in December is 4.4h.

What is the month 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.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Delavan, IL

Average temperature in December - Delavan, IL
  • Average high temperature in December: 36.9°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in December: 26.4°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in December
Delavan, IL

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Delavan, IL

Average wind speed in December - Delavan, 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 (6.4mph).

Average humidity in December
Delavan, IL

Average humidity in December - Delavan, IL
  • Average humidity in December: 79%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Delavan, IL

Average rainfall in December - Delavan, IL
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").

Average rainfall days in December
Delavan, IL

Average rainfall days in December - Delavan, IL
  • Average rainfall days in December: 6.6 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.1 days).

Average snowfall in December
Delavan, IL

Average snowfall in December - Delavan, IL
  • Average snowfall in December: 1.22"

The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Delavan, IL

Average snowfall days in December - Delavan, IL
  • Average snowfall days in December: 5.4 days

The month with the highest number of snowfall days is January (8.4 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
Delavan, IL

Average daylight in December / Average sunshine in December - Delavan, 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 2min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in December
Delavan, IL

Average sunshine days in December - Delavan, IL
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in December
Delavan, IL

Average UV index in December - Delavan, 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
Delavan, IL

Average cloud cover in December - Delavan, IL
  • Average cloud cover in December: 53

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).

Average visibility in December
Delavan, IL

Average visibility in December - Delavan, 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).

Delavan, Illinois, USA

Weather forecast for your location

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