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 shift from November to December involves a decrease in the average high-temperature, dropping from a fresh 50.9°F (10.5°C) to a wintry 39°F (3.9°C). During the month of December, an average temperature of 27.9°F (-2.3°C) is noted during the nights in Griggsville.Humidity
The average relative humidity in December in Griggsville is 77%.Rainfall
In Griggsville, in December, it is raining for 7 days, with typically 0.87" (22mm) of accumulated precipitation. In Griggsville, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Griggsville, Illinois. In December, it is snowing for 4.2 days. Throughout December, 0.79" (20mm) of snow is accumulated. Throughout the year, there are 21.9 snowfall days, and 5.67" (144mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of December, in Griggsville, sunrise is at 7:23 am and sunset at 4:48 pm CST.
Sunshine
In December, the average sunshine in Griggsville is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 2 during December translates into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
How cold does it get in Griggsville in December?
What is the average humidity in December in Griggsville?
How much does it rain in Griggsville in December?
How many days does it snow in December in Griggsville?
What is the month with the shortest days in Griggsville?
What is the average length of the day in December in Griggsville?
What time are sunrise and sunset in December in Griggsville?
How long on average sun shines in December in Griggsville?
When is the lowest UV index in Griggsville?
How high is the UV index in December in Griggsville?
Average temperature in December
Griggsville, IL
- Average high temperature in December: 39°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Griggsville, 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
Griggsville, IL
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Griggsville, IL
- Average humidity in December: 77%
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
Griggsville, IL
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in December
Griggsville, IL
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Griggsville, IL
- Average snowfall in December: 0.79"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Griggsville, IL
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (6.3 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
Griggsville, 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 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Griggsville, IL
- Average sunshine days in December: 20.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in December
Griggsville, 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
Griggsville, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in December
Griggsville, 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).
Griggsville, Illinois, USA
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