December weather forecastManly, IA
December
Weather in December
December, the first month of the winter in Manly, is still a freezing cold month, with an average temperature ranging between max 27.3°F (-2.6°C) and min 16.5°F (-8.6°C).Temperature
The beginning of December involves a decrease in the average high-temperature, transitioning from a cold 41.4°F (5.2°C) in November to a subzero cold 27.3°F (-2.6°C). Manly's nights in December cool down to an average low-temperature of 16.5°F (-8.6°C).Humidity
In Manly, the average relative humidity in December is 87%.Rainfall
In Manly, during December, the rain falls for 5.5 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Manly, during the entire year, the rain falls for 134.3 days and collects up to 25.08" (637mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Manly, in December, during 12.6 snowfall days, 3.66" (93mm) of snow is typically accumulated. In Manly, during the entire year, snow falls for 57 days and aggregates up to 22.83" (580mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:25 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:47 pm CST.
Sunshine
The average sunshine in December in Manly is 3.9h.UV index
The months with the lowest UV index in Manly are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 1 in December translates into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To cut down UV radiation exposure by about half, sport a wide-brim hat. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Manly, IA
- Average high temperature in December: 27.3°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in December: 16.5°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9°F).
Average pressure in December
Manly, 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 (29.88"Hg).
Average wind speed in December
Manly, IA
- Average wind speed in December: 10.1mph
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 (7.4mph).
Average humidity in December
Manly, IA
- Average humidity in December: 87%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and October (72%).
Average rainfall in December
Manly, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (4.13").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Manly, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (18.4 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in December
Manly, IA
- Average snowfall in December: 3.66"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Manly, IA
- Average snowfall days in December: 12.6 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Manly, IA
- Average daylight in December: 9h and 0min
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 0min).
- Average sunshine in December: 3h and 54min
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 24min).
Average sunshine days in December
Manly, IA
- Average sunshine days in December: 14.7 days
The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in December
Manly, 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, February, November and December (UV index 1).
Average cloud cover in December
Manly, IA
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Manly, IA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
