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
December comes with a drop in the average high-temperature, falling from November's cool 50.2°F (10.1°C) to an icy 38.7°F (3.7°C). Throughout the nights in December, Mechanicsburg experiences an average low-temperature of 28.2°F (-2.1°C).Humidity
In Mechanicsburg, the average relative humidity in December is 78%.Rainfall
The month with the least rainfall is December, when the rain falls for 7.5 days and typically collects 1.14" (29mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Mechanicsburg, in December, during 6.5 snowfall days, 1.06" (27mm) of snow is typically accumulated. In Mechanicsburg, during the entire year, snow falls for 27.9 days and aggregates up to 6.14" (156mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:43 pm CST.
Sunshine
The average sunshine in December is 4.7h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mechanicsburg, Illinois. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: An average UV index of 2 in December transforms into this advice:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Mechanicsburg in December?
What is the average humidity in December in Mechanicsburg?
What is the driest month in Mechanicsburg?
How many days does it rain in December in Mechanicsburg?
How many days does it snow in December in Mechanicsburg?
What is the month with the shortest days in Mechanicsburg?
How many hours of daylight does Mechanicsburg have in December?
When are sunrise and sunset in December in Mechanicsburg?
How long on average sun shines in December in Mechanicsburg?
When is the lowest UV index in Mechanicsburg?
What is the UV index reading in December in Mechanicsburg?
Average temperature in December
Mechanicsburg, IL
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).
Average pressure in December
Mechanicsburg, 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 (29.92"Hg).
Average wind speed in December
Mechanicsburg, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Mechanicsburg, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Mechanicsburg, IL
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is April (2.64").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in December
Mechanicsburg, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in December
Mechanicsburg, IL
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mechanicsburg, IL
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (8.3 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
Mechanicsburg, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Mechanicsburg, IL
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is July (11 days).
Average UV index in December
Mechanicsburg, 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
Mechanicsburg, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Mechanicsburg, 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).
Mechanicsburg, Illinois, USA
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