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
With December's onset, the weather shows a temperature decrease, transitioning from a frosty 44.1°F (6.7°C) in November to a freezing cold 30.7°F (-0.7°C). In Ackley, an average nighttime temperature of 19.9°F (-6.7°C) is expected during December.Humidity
The average relative humidity in December is 83%.Rainfall
In December, the rain falls for 5.5 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. Throughout the year, there are 143.1 rainfall days, and 30.24" (768mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Ackley, in December, during 11.8 snowfall days, 4.25" (108mm) of snow is typically accumulated. In Ackley, during the entire year, snow falls for 51.1 days and aggregates up to 21.26" (540mm) of snow.Daylight
The month with the shortest days in Ackley, Iowa, is December, with an average of 9h and 6min of daylight.On the first day of December in Ackley, Iowa, sunrise is at 7:23 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:49 pm CST.
Sunshine
In Ackley, the average sunshine in December is 4.2h.UV index
In Ackley, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Ackley in December?
What is the average humidity in December in Ackley?
How many days does it rain in December in Ackley?
How much does it snow in Ackley in December?
What is the month with the shortest days in Ackley?
What is the average length of the day in December in Ackley?
What time are sunrise and sunset in December in Ackley?
How many hours of sunshine does Ackley have in December?
What is the UV index reading in December in Ackley?
Average temperature in December
Ackley, IA
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (24.1°F).
- Average low temperature in December: 19.9°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in December
Ackley, 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 (29.89"Hg).
Average wind speed in December
Ackley, IA
- Average wind speed in December: 10.4mph
The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.2mph).
Average humidity in December
Ackley, IA
- Average humidity in December: 83%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Ackley, IA
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is June (4.76").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Ackley, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (19.8 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Ackley, IA
- Average snowfall in December: 4.25"
The month with the highest snowfall is February (5.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Ackley, IA
- Average snowfall days in December: 11.8 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Ackley, 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 months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Ackley, IA
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (8.1 days).
Average UV index in December
Ackley, IA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Ackley, IA
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Ackley, IA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Ackley, Iowa, USA
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