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 transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a fresh 53.8°F (12.1°C) in November to a chilly 43.7°F (6.5°C). During the month of December, the temperature falls to an average of 31.1°F (-0.5°C).Humidity
In Percy, the average relative humidity in December is 77%.Rainfall
In December, in Percy, the rain falls for 8.9 days. Throughout December, 2.56" (65mm) of precipitation is accumulated. Throughout the year, there are 159.4 rainfall days, and 37.2" (945mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Percy, during December, snow falls for 3.8 days and regularly aggregates up to 1.26" (32mm) of snow. In Percy, during the entire year, snow falls for 20.9 days and aggregates up to 8.11" (206mm) of snow.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:56 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:49 pm CST.
Sunshine
In Percy, the average sunshine in December is 4.9h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Percy?
What is the average humidity in December in Percy?
How many days does it rain in December in Percy?
How many days does it snow in December in Percy?
What is the month with the shortest days in Percy?
What is the average length of the day in December in Percy?
What time are sunrise and sunset in December in Percy?
How long on average sun shines in December in Percy?
What is the month with the lowest UV index in Percy?
What is the UV index intensity in December in Percy?
Average temperature in December
Percy, IL
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Percy, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Percy, IL
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Percy, IL
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Percy, IL
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is May (4.49").
The driest months (with the least rainfall) are February and September (2.13").
Average rainfall days in December
Percy, IL
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Percy, IL
- Average snowfall in December: 1.26"
The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Percy, IL
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (7.1 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
Percy, IL
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Percy, IL
- Average sunshine days in December: 18.2 days
The month with the most sunshine days is December (18.2 days).
The month with the least sunshine days is May (10.4 days).
Average UV index in December
Percy, 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 and December (UV index 2).
Average cloud cover in December
Percy, IL
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in December
Percy, 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).
Percy, Illinois, USA
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