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 start of December comes with a reduction in the average high-temperature, receding from a chilly 47.1°F (8.4°C) in November to a cold 34.7°F (1.5°C). In December, the average low-temperature records at a freezing cold 23°F (-5°C) during the nights.Humidity
In December, the average relative humidity is 79%.Rainfall
February and December are months with the least rain when the rain falls for 5.5 days and typically aggregates up to 0.47" (12mm) of rain.Snowfall
Months with snowfall are January through May, October through December. In Knoxville, in December, snow falls for 6.4 days, with typically accumulated 0.75" (19mm) of snow. Throughout the year, in Knoxville, there are 30.4 snowfall days, and 6.5" (165mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:19 am and sunset at 4:43 pm. On the last day of December, in Knoxville, sunrise is at 7:38 am and sunset at 4:53 pm CST.
Sunshine
The average sunshine in December in Knoxville is 4.8h.UV index
In Knoxville, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Knoxville in December?
What is the average humidity in December in Knoxville?
What is the driest month in Knoxville?
How many days does it rain in December in Knoxville?
How many days does it snow in December in Knoxville?
What is the month with the shortest days in Knoxville?
How many hours of daylight does Knoxville have in December?
What time are sunrise and sunset in December in Knoxville?
How long on average sun shines in December in Knoxville?
How high is the UV index in December in Knoxville?
Average temperature in December
Knoxville, IA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in December: 23°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Knoxville, 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 (29.89"Hg).
Average wind speed in December
Knoxville, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in December
Knoxville, 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 (71%).
Average rainfall in December
Knoxville, IA
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in December
Knoxville, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in December
Knoxville, IA
- Average snowfall in December: 0.75"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Knoxville, IA
- Average snowfall days in December: 6.4 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Knoxville, IA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Knoxville, IA
- Average sunshine days in December: 20.5 days
The months with the most sunshine days are November and December (20.5 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in December
Knoxville, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Knoxville, IA
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in December
Knoxville, 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).
Knoxville, Iowa, USA
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