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 onset of December coincides with a reduction in the average high-temperature, falling from a frosty 48.9°F (9.4°C) in November to a wintry 37.6°F (3.1°C). December nights are marked by an average temperature drop to a freezing cold 27.3°F (-2.6°C).Humidity
In Parnell, the average relative humidity in December is 80%.Rainfall
December is the month with the least rainfall in Parnell. Rain falls for 7.6 days and accumulates 1.1" (28mm) of precipitation.Snowfall
Months with snowfall in Parnell are January through April, November and December. In Parnell, in December, during 5.5 snowfall days, 1.3" (33mm) of snow is typically accumulated. Throughout the year, in Parnell, there are 27.3 snowfall days, and 9.09" (231mm) of snow is accumulated.Daylight
December has the shortest days of the year in Parnell, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:58 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:39 pm CST.
Sunshine
In December, the average sunshine in Parnell is 4.4h.UV index
The months with the lowest UV index in Parnell are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Parnell in December?
What is the average humidity in December in Parnell?
What is the driest month in Parnell?
How much does it rain in Parnell in December?
How many days does it snow in December in Parnell?
What is the month with the shortest days in Parnell?
How many hours of daylight does Parnell have in December?
When are sunrise and sunset in December in Parnell?
How many hours of sunshine does Parnell have in December?
What are the months with the lowest UV index in Parnell?
How high is the UV index in December in Parnell?
Average temperature in December
Parnell, IL
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in December
Parnell, 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 (29.92"Hg).
Average wind speed in December
Parnell, IL
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Parnell, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Parnell, IL
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in December
Parnell, IL
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in December
Parnell, IL
- Average snowfall in December: 1.3"
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Parnell, IL
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (9.6 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
Parnell, 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 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Parnell, IL
- Average sunshine days in December: 18.3 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.4 days).
Average UV index in December
Parnell, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Parnell, 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
Parnell, 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).
Parnell, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location