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 arrival of December corresponds with a reduction in the average high-temperature, down from November's frosty 45.9°F (7.7°C) to a subzero cold 31.8°F (-0.1°C). In Denison, December's nights observe an average temperature dip to a still freezing cold 20.3°F (-6.5°C).Humidity
In December, the average relative humidity in Denison, Iowa, is 80%.Rainfall
In Denison, during December, the rain falls for 4.5 days and regularly aggregates up to 1.3" (33mm) of precipitation. Throughout the year, there are 123 rainfall days, and 24.72" (628mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Denison, in December, snow falls for 8 days, with typically accumulated 2.44" (62mm) of snow. Throughout the year, in Denison, Iowa, there are 36.8 snowfall days, and 14.53" (369mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:30 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:00 pm CST.
Sunshine
The average sunshine in December in Denison is 4.7h.UV index
The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. 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 is December in Denison?
What is the average humidity in December in Denison?
How many days does it rain in December in Denison?
How many days does it snow in December in Denison?
What is the month with the shortest days in Denison?
What is the average length of the day in December in Denison?
When is the sunrise / sunset in December in Denison?
How long on average sun shines in December in Denison?
What is the UV index intensity in December in Denison?
Average temperature in December
Denison, IA
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 20.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14°F).
Average pressure in December
Denison, IA
- 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 (29.87"Hg).
Average wind speed in December
Denison, IA
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in December
Denison, IA
- Average humidity in December: 80%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in December
Denison, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in December
Denison, IA
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Denison, IA
- Average snowfall in December: 2.44"
The month with the highest snowfall is February (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Denison, IA
- Average snowfall days in December: 8 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Denison, 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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Denison, IA
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in December
Denison, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Denison, IA
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Denison, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Denison, Iowa, USA
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