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
A moderate decline in average high-temperatures is noted in December, moving from a refreshing 60.8°F (16°C) in November to a fresh 54.5°F (12.5°C). Great Falls experiences a nighttime temperature average of 40.1°F (4.5°C) during December.Humidity
May and December, with an average relative humidity of 75%, are the most humid months in Great Falls.Rainfall
In Great Falls, during December, the rain falls for 10.8 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, there are 152.5 rainfall days, and 29.53" (750mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In Great Falls, in December, snow falls for 0.2 days, with typically accumulated 0.08" (2mm) of snow. In Great Falls, during the entire year, snow falls for 2.2 days and aggregates up to 1.5" (38mm) of snow.Daylight
With an average of 9h and 54min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:12 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:23 pm EST.
Sunshine
With an average of 5.4h of sunshine, December has the least sunshine of the year in Great Falls.UV index
The average daily maximum UV index in December in Great Falls is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 3 during December translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Great Falls?
What are the most humid months in Great Falls?
What is the average humidity in December in Great Falls?
How much does it rain in Great Falls in December?
How many days does it snow in December in Great Falls?
What is the month with the shortest days in Great Falls?
How many hours of daylight does Great Falls have in December?
When is the sunrise / sunset in December in Great Falls?
What is the month with the least sunshine in Great Falls?
How many hours of sunshine does Great Falls have in December?
What is the UV index reading in December in Great Falls?
Average temperature in December
Great Falls, SC
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (50.9°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (35.6°F).
Average pressure in December
Great Falls, SC
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Great Falls, SC
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Great Falls, SC
- Average humidity in December: 75%
The months with the highest relative humidity are May and December (75%).
The months with the lowest relative humidity are July and November (71%).
Average rainfall in December
Great Falls, SC
- Average rainfall in December: 3.03"
The wettest month (with the highest rainfall) is August (3.19").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Great Falls, SC
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is October (8.4 days).
Average snowfall in December
Great Falls, SC
- Average snowfall in December: 0.08"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Great Falls, SC
- Average snowfall days in December: 0.2 days
The months with the highest number of snowfall days are January and February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Great Falls, SC
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Great Falls, SC
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is October (21.3 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in December
Great Falls, SC
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in December
Great Falls, SC
- Average cloud cover in December: 42
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Great Falls, SC
- 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).
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