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
In December, the meteorological conditions alter, with the average high-temperature shifting from a cool 50.9°F (10.5°C) in November to an icy 39°F (3.9°C). Griggsville registers a consistent average low-temperature of 27.9°F (-2.3°C) during December.Humidity
The average relative humidity in December is 77%.Rainfall
In Griggsville, during December, the rain falls for 7 days and regularly aggregates up to 0.87" (22mm) of precipitation. In Griggsville, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Griggsville, in December, snow falls for 4.2 days, with typically accumulated 0.79" (20mm) of snow. In Griggsville, during the entire year, snow falls for 21.9 days and aggregates up to 5.67" (144mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:48 pm CST.
Sunshine
In Griggsville, the average sunshine in December 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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Griggsville in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Griggsville have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity 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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