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 arrival of December indicates a decrease in the average high-temperature, moving from a fresh 50.2°F (10.1°C) in November to a wintry 38.5°F (3.6°C). Nighttime temperature in Mendon experiences an average drop to a subzero cold 26.8°F (-2.9°C) in December.Humidity
In Mendon, the average relative humidity in December is 78%.Rainfall
The months with the least rainfall are January and December Rain falls for 5.8 days and accumulates 1.02" (26mm) of rain.Snowfall
Months with snowfall are January through April, October through December. In Mendon, during December, snow falls for 5.5 days and regularly aggregates up to 1.46" (37mm) of snow. In Mendon, during the entire year, snow falls for 27.6 days and aggregates up to 7.95" (202mm) of snow.Daylight
The month with the shortest days in Mendon is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:49 pm CST.
Sunshine
The average sunshine in December in Mendon is 4.7h.UV index
The months with the lowest UV index 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 unsafe exposure to UV radiation for average individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Minimize direct exposure to the Sun during midday when its radiation is at its peak. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold?
What is the average humidity in December in Mendon?
What is the driest month?
How much does it rain in Mendon 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 Mendon have in December?
What are the months with the lowest UV index?
What is the UV index reading in December in Mendon?
Average temperature in December
Mendon, IL
- Average high temperature in December: 38.5°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (32.7°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Mendon, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Mendon, IL
- Average wind speed in December: 9.8mph
The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in December
Mendon, IL
- Average humidity in December: 78%
The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mendon, IL
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are January and December (1.02").
Average rainfall days in December
Mendon, IL
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (5 days).
Average snowfall in December
Mendon, IL
- Average snowfall in December: 1.46"
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mendon, IL
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (8.8 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
Mendon, 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 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Mendon, IL
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in December
Mendon, 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
Mendon, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Mendon, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Mendon, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location