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
Irwin's transition into December involves a shift in temperature, receding from a frosty 46.2°F (7.9°C) in November to a cold 32.2°F (0.1°C). Irwin, in December, observes a steady average low-temperature of 20.8°F (-6.2°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In Irwin, in December, during 4.2 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 113.5 rainfall days, and 15.71" (399mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 6.1 days. Throughout December, 1.06" (27mm) of snow is accumulated. Throughout the year, there are 31.5 snowfall days, and 7.13" (181mm) of snow is accumulated.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 7:29 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:48 am and sunset at 5:00 pm CST.
Sunshine
In December, the average sunshine in Irwin is 4.8h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In December, a daily UV index of 2 turns into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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 many days does it rain in December in Irwin?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Irwin have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Irwin have in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Irwin, IA
- Average high temperature in December: 32.2°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in December: 20.8°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in December
Irwin, 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
Irwin, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
Irwin, IA
- Average humidity in December: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Irwin, IA
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Irwin, IA
- Average rainfall days in December: 4.2 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in December
Irwin, IA
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Irwin, IA
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Irwin, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Irwin, IA
- Average sunshine days in December: 21.6 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).
Average UV index in December
Irwin, IA
- 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, October, November and December (UV index 2).
Average cloud cover in December
Irwin, IA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Irwin, IA
- 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).
Irwin, Iowa, USA
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