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 move into December indicates a reduction in the average high-temperature, down from November's fresh 50.7°F (10.4°C) to an icy 40.1°F (4.5°C). In December, the temperature drops to an average of 29.3°F (-1.5°C) at night.Humidity
The most humid month is December, with an average relative humidity of 82%.Rainfall
In Marietta, in December, during 9.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. In Marietta, during the entire year, the rain falls for 149.3 days and collects up to 25.83" (656mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Marietta, in December, during 6.5 snowfall days, 1.54" (39mm) of snow is typically accumulated. In Marietta, during the entire year, snow falls for 28.6 days and aggregates up to 8.15" (207mm) of snow.Daylight
December has the shortest days of the year in Marietta, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:45 am and sunset at 5:20 pm. On the last day of December, sunrise is at 8:03 am and sunset at 5:30 pm EST.
Sunshine
In December, the average sunshine is 4.3h.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 2 suggests these recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the most humid month?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Marietta have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Marietta, IN
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Marietta, IN
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Marietta, IN
- Average wind speed in December: 8.3mph
The windiest months (with the highest average wind speed) are January and February (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Marietta, IN
- Average humidity in December: 82%
The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Marietta, IN
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in December
Marietta, IN
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in December
Marietta, IN
- Average snowfall in December: 1.54"
The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Marietta, IN
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Marietta, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Marietta, IN
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
Marietta, IN
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Marietta, IN
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Marietta, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Marietta, Indiana, USA
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