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
As November shifts into December, a slight alteration in temperatures is observed, with average highs reducing from a chilly 46.2°F (7.9°C) to an icy 34°F (1.1°C). Throughout the December nights, Walnut encounters a low-temperature of 23.9°F (-4.5°C).Humidity
The average relative humidity in December is 82%.Rainfall
In December, in Walnut, the rain falls for 4.8 days. Throughout December, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 114.5 rainfall days, and 12.72" (323mm) of precipitation is accumulated.Snowfall
Months with snowfall in Walnut are January through April, October through December. In Walnut, in December, snow falls for 6.5 days, with typically accumulated 0.94" (24mm) of snow. In Walnut, during the entire year, snow falls for 31.5 days and aggregates up to 5.2" (132mm) of snow.Daylight
December has the shortest days of the year in Walnut, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:06 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:38 pm CST.
Sunshine
The average sunshine in December in Walnut is 4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 1 in December leads to these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
How cold is it in Walnut in December?
What is the average humidity in December in Walnut?
How many days does it rain in December in Walnut?
How many days does it snow in December in Walnut?
What is the month with the shortest days in Walnut?
How many hours of daylight does Walnut have in December?
When is the sunrise / sunset in December in Walnut?
How many hours of sunshine does Walnut have in December?
What is the month with the lowest UV index in Walnut?
How high is the UV index in December in Walnut?
Average temperature in December
Walnut, IL
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.5°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure in December
Walnut, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Walnut, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Walnut, IL
- Average humidity in December: 82%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Walnut, IL
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is May (2.01").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in December
Walnut, IL
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in December
Walnut, IL
- Average snowfall in December: 0.94"
The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Walnut, IL
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (10.1 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
Walnut, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Walnut, IL
- Average sunshine days in December: 20.8 days
The month with the most sunshine days is December (20.8 days).
The month with the least sunshine days is June (13.5 days).
Average UV index in December
Walnut, IL
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Walnut, IL
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in December
Walnut, 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).
Walnut, Illinois, USA
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