December weather forecastMarion, IA
December
Weather in December
Closing the year is the cold December weather in Marion. Winter conditions become fully pronounced in the city with 3.11" (79mm) of snow covering the ground. Iowans wrap up warmly, battling the freezing temperatures and reduced daylight hours. The winter holiday ambiance is enhanced by snowy landscapes and chilled winds. December marks the apex of winter, with the celebration of holidays brightening up the short daylight spans.Temperature
Marion in December experiences a subtle temperature decline, with average high-temperatures reducing from a frosty 45.3°F (7.4°C) in November to a cold 33.1°F (0.6°C). Nighttime temperatures in December average to a freezing cold 22.3°F (-5.4°C).Humidity
The average relative humidity in December in Marion is 81%.Rainfall
In December, the rain falls for 6.8 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. In Marion, during the entire year, the rain falls for 147.9 days and collects up to 31.57" (802mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Marion, in December, snow falls for 9.5 days, with typically accumulated 3.11" (79mm) of snow. In Marion, during the entire year, snow falls for 44 days and aggregates up to 18.35" (466mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:15 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:45 pm CST.
Sunshine
The average sunshine in December is 4.3h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Marion, IA
- Average high temperature in December: 33.1°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure in December
Marion, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Marion, IA
- Average wind speed in December: 10mph
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 (7mph).
Average humidity in December
Marion, IA
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Marion, IA
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in December
Marion, IA
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is May (19 days).
The months with the least rainy days are January and February (5.2 days).
Average snowfall in December
Marion, IA
- Average snowfall in December: 3.11"
The month with the highest snowfall is January (5.79").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Marion, IA
- Average snowfall days in December: 9.5 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Marion, IA
- Average daylight in December: 9h and 12min
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 18min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Marion, IA
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (8.1 days).
Average UV index in December
Marion, IA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Marion, IA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Marion, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
