December weather forecastMarty, SD
December
Weather in December
December, the first month of the winter in Marty, is still a freezing cold month, with an average temperature fluctuating between 30.4°F (-0.9°C) and 18.3°F (-7.6°C).Temperature
A noticeable downshift in temperatures is seen as November gives way to December, with average highs moving from a frosty 46.4°F (8°C) to a freezing cold 30.4°F (-0.9°C). Marty's nights in December cool down to an average low-temperature of 18.3°F (-7.6°C).Humidity
In Marty, South Dakota, the average relative humidity in December is 81%.Rainfall
In Marty, in December, it is raining for 3.1 days, with typically 0.59" (15mm) of accumulated precipitation. In Marty, during the entire year, the rain falls for 104.1 days and collects up to 14.29" (363mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Marty, South Dakota, in December, during 6.5 snowfall days, 1.22" (31mm) of snow is typically accumulated. In Marty, during the entire year, snow falls for 32.8 days and aggregates up to 8.35" (212mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:45 am and sunset at 5:00 pm. On the last day of December, sunrise is at 8:04 am and sunset at 5:09 pm CST.
Sunshine
The average sunshine in December is 4.9h.UV index
January, February, November and 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 minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: In December, a daily UV index of 2 turns into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Marty, SD
- Average high temperature in December: 30.4°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in December: 18.3°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Marty, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Marty, SD
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in December
Marty, SD
- Average humidity in December: 81%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (62%).
Average rainfall in December
Marty, SD
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is February (0.31").
Average rainfall days in December
Marty, SD
- Average rainfall days in December: 3.1 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (2.9 days).
Average snowfall in December
Marty, SD
- Average snowfall in December: 1.22"
The months with the highest snowfall are January and March (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Marty, SD
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (8.2 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
Marty, SD
- Average daylight in December: 9h and 6min
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 6min).
- Average sunshine in December: 4h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Marty, SD
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in December
Marty, 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, November and December (UV index 2).
Average cloud cover in December
Marty, SD
- Average cloud cover in December: 46
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 23).
Average visibility in December
Marty, SD
- 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).
