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
Mellette sees a considerable decrease in average high-temperatures during December, falling from a cold 41.7°F (5.4°C) in November to a freezing cold 25°F (-3.9°C). In Mellette, the expected average low-temperature for December is an extreme cold 12.7°F (-10.7°C).Humidity
In December, the average relative humidity in Mellette is 85%.Rainfall
In Mellette, South Dakota, in December, during 3.1 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In Mellette, during the entire year, the rain falls for 97.2 days and collects up to 18.35" (466mm) of precipitation.Snowfall
Months with snowfall in Mellette, South Dakota, are January through May, October through December. In Mellette, in December, during 11.4 snowfall days, 3.43" (87mm) of snow is typically accumulated. Throughout the year, in Mellette, South Dakota, there are 54.8 snowfall days, and 19.13" (486mm) of snow is accumulated.Daylight
The month with the shortest days in Mellette is December, with an average of 8h and 48min of daylight.On the first day of December in Mellette, South Dakota, sunrise is at 7:53 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 8:12 am and sunset at 5:02 pm CST.
Sunshine
In December, the average sunshine in Mellette is 4.3h.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mellette in December?
What is the average humidity in December in Mellette?
How much does it rain in Mellette in December?
How many days does it snow in December in Mellette?
What is the month with the shortest days in Mellette?
How many hours of daylight does Mellette have in December?
What time are sunrise and sunset in December in Mellette?
How long on average sun shines in December in Mellette?
How high is the UV index in December in Mellette?
Average temperature in December
Mellette, SD
- Average high temperature in December: 25°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (20.7°F).
- Average low temperature in December: 12.7°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure in December
Mellette, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Mellette, SD
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in December
Mellette, SD
- Average humidity in December: 85%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (60%).
Average rainfall in December
Mellette, SD
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in December
Mellette, SD
- Average rainfall days in December: 3.1 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2 days).
Average snowfall in December
Mellette, SD
- Average snowfall in December: 3.43"
The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mellette, SD
- Average snowfall days in December: 11.4 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mellette, SD
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Mellette, SD
- Average sunshine days in December: 18.9 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12.7 days).
Average UV index in December
Mellette, SD
- 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 and November (UV index 1).
Average cloud cover in December
Mellette, SD
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility in December
Mellette, SD
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Mellette, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location