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 introduces a moderate change in Grantfork's weather, with average high-temperatures falling from November's fresh 52.3°F (11.3°C) to an icy 41.5°F (5.3°C). Grantfork witnesses a consistent average low-temperature of 30°F (-1.1°C) throughout December.Humidity
The average relative humidity in December in Grantfork is 77%.Rainfall
In December, the rain falls for 5.9 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 110.6 rainfall days, and 12.01" (305mm) of precipitation is accumulated.Snowfall
January through March, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 3.1 days and typically aggregates up to 0.94" (24mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:58 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:47 pm CST.
Sunshine
In Grantfork, the average sunshine in December is 4.8h.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 estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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 Grantfork?
How much does it rain in December?
When does it snow the most in Grantfork?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Grantfork have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Grantfork have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Grantfork, IL
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).
Average pressure in December
Grantfork, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Grantfork, IL
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Grantfork, IL
- Average humidity in December: 77%
The months with the highest relative humidity are July and August (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Grantfork, IL
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in December
Grantfork, IL
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (13.1 days).
The months with the least rainy days are January and December (5.9 days).
Average snowfall in December
Grantfork, IL
- Average snowfall in December: 0.94"
The month with the highest snowfall is December (0.94").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Grantfork, IL
- Average snowfall days in December: 3.1 days
The months with the highest number of snowfall days are January and February (4.8 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
Grantfork, IL
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Grantfork, IL
- Average sunshine days in December: 21.8 days
The month with the most sunshine days is December (21.8 days).
The month with the least sunshine days is July (14.5 days).
Average UV index in December
Grantfork, IL
- Average UV index in December: 2
The months with the highest UV index are May, 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
Grantfork, IL
- Average cloud cover in December: 49
The months with the most cloud cover are January and February (Cloud cover 50).
The months with the least cloud cover are June, July, August and September (Cloud cover 28).
Average visibility in December
Grantfork, 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).
Grantfork, Illinois, USA
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