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
As December arrives, a noticeable drop in the average high-temperature is witnessed, moving from a chilly 42.8°F (6°C) in November to a freezing cold 28.2°F (-2.1°C). Throughout December, an average low-temperature of 17.8°F (-7.9°C) is expected in Duncan.Humidity
In Duncan, the average relative humidity in December is 86%.Rainfall
In Duncan, in December, during 5.5 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Throughout the year, there are 127.1 rainfall days, and 24.8" (630mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Duncan, in December, snow falls for 11.2 days, with typically accumulated 3.19" (81mm) of snow. Throughout the year, in Duncan, there are 51.2 snowfall days, and 20.91" (531mm) of snow is accumulated.Daylight
December has the shortest days of the year in Duncan, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:27 am and sunset at 4:40 pm. On the last day of December, in Duncan, sunrise is at 7:46 am and sunset at 4:49 pm CST.
Sunshine
The average sunshine in December in Duncan is 4.2h.UV index
The months with the lowest UV index in Duncan are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. It's recommended to limit sun exposure when its radiation is at its peak during midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Frequently asked questions
How cold is December in Duncan?
What is the average humidity in December in Duncan?
How many days does it rain in December in Duncan?
How many days does it snow in December in Duncan?
What is the month with the shortest days in Duncan?
How many hours of daylight does Duncan have in December?
When is the sunrise / sunset in December in Duncan?
How many hours of sunshine does Duncan have in December?
What are the months with the lowest UV index in Duncan?
What is the UV index intensity in December in Duncan?
Average temperature in December
Duncan, IA
- Average high temperature in December: 28.2°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in December: 17.8°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (10.4°F).
Average pressure in December
Duncan, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Duncan, IA
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in December
Duncan, IA
- Average humidity in December: 86%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (69%).
Average rainfall in December
Duncan, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (3.82").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Duncan, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in December
Duncan, IA
- Average snowfall in December: 3.19"
The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Duncan, IA
- Average snowfall days in December: 11.2 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Duncan, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Duncan, IA
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in December
Duncan, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Duncan, IA
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Duncan, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Duncan, Iowa, USA
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