December weather forecastHermosa, SD
December
Weather in December
The first month of the winter, December, is also a wintry month in Hermosa, South Dakota, with temperature in the range of an average low of 18.7°F (-7.4°C) and an average high of 32.5°F (0.3°C).Temperature
Hermosa witnesses the coldest weather in December, with temperatures averaging a high of 32.5°F (0.3°C) and a low of 18.7°F (-7.4°C).Humidity
In December, the average relative humidity is 74%.Rainfall
In Hermosa, in December, during 4.8 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, there are 118.8 rainfall days, and 15.39" (391mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In Hermosa, in December, snow falls for 8.1 days, with typically accumulated 2.64" (67mm) of snow. In Hermosa, during the entire year, snow falls for 50.4 days and aggregates up to 24.41" (620mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:07 am and sunset at 4:16 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:25 pm MST.
Sunshine
The average sunshine in December is 6h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 2 in December translates into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hermosa, SD
- Average high temperature in December: 32.5°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in December: 18.7°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).
Average pressure in December
Hermosa, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Hermosa, SD
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (8.2mph).
Average humidity in December
Hermosa, SD
- Average humidity in December: 74%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (50%).
Average rainfall in December
Hermosa, SD
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is May (2.28").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Hermosa, SD
- Average rainfall days in December: 4.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is December (4.8 days).
Average snowfall in December
Hermosa, SD
- Average snowfall in December: 2.64"
The month with the highest snowfall is April (5.43").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Hermosa, SD
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Hermosa, SD
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in December
Hermosa, SD
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11 days).
Average UV index in December
Hermosa, SD
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Hermosa, SD
- Average cloud cover in December: 36
The months with the most cloud cover are February and April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in December
Hermosa, 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).
