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
Onset of December comes with a temperature decline, the average high falling from a frosty 45.5°F (7.5°C) in November to a wintry 32.2°F (0.1°C). In Griffen, in December, the average low-temperature is a subzero cold 21°F (-6.1°C).Humidity
The average relative humidity in December is 81%.Rainfall
In Griffen, in December, during 4.7 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 123.3 rainfall days, and 20.98" (533mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Griffen, in December, during 8.6 snowfall days, 1.73" (44mm) of snow is typically accumulated. In Griffen, during the entire year, snow falls for 39.9 days and aggregates up to 10.91" (277mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:24 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:43 am and sunset at 4:53 pm CST.
Sunshine
The average sunshine in December in Griffen is 4.6h.UV index
January, February, October through 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 health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in Griffen in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Griffen have in December?
What time are sunrise and sunset in December in Griffen?
How many hours of sunshine does Griffen have in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Griffen, IA
- Average high temperature in December: 32.2°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (26.4°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in December
Griffen, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Griffen, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Griffen, IA
- Average humidity in December: 81%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in December
Griffen, IA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Griffen, IA
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in December
Griffen, IA
- Average snowfall in December: 1.73"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Griffen, IA
- Average snowfall days in December: 8.6 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Griffen, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Griffen, IA
- Average sunshine days in December: 19 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in December
Griffen, IA
- 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, October, November and December (UV index 2).
Average cloud cover in December
Griffen, IA
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Griffen, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Griffen, Iowa, USA
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