Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
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.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Delavan have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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
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