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
December brings a decrease in the average high-temperature, shifting from a frosty 44.6°F (7°C) in November to a subzero cold 31.5°F (-0.3°C). Morrison records an average low-temperature of 20.5°F (-6.4°C) throughout the month of December.Humidity
The average relative humidity in December is 82%.Rainfall
In Morrison, in December, during 6.5 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. Throughout the year, there are 144.6 rainfall days, and 30.75" (781mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Morrison, in December, snow falls for 10.5 days, with typically accumulated 3.46" (88mm) of snow. Throughout the year, there are 47.7 snowfall days, and 19.02" (483mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:20 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:39 am and sunset at 4:48 pm CST.
Sunshine
In December, the average sunshine is 4.4h.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 translates into these guidelines:
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. Around midday, solar radiation is most harmful; hence, exposure should be limited. Always opt for UVA and UVB-resistant sunglasses on radiant days. 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 it in Morrison in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December in Morrison?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Morrison have in December?
What is the UV index intensity in December?
Average temperature in December
Morrison, IA
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in December: 20.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in December
Morrison, IA
- Average pressure in December: 30.11"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Morrison, IA
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Morrison, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Morrison, IA
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is May (4.76").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Morrison, IA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is June (19.6 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in December
Morrison, IA
- Average snowfall in December: 3.46"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Morrison, IA
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Morrison, 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 6min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Morrison, IA
- Average sunshine days in December: 16.7 days
The months with the most sunshine days are October and November (16.9 days).
The month with the least sunshine days is June (7.9 days).
Average UV index in December
Morrison, IA
- Average UV index in December: 2
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Morrison, IA
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Morrison, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Morrison, Iowa, USA
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