December weather forecastMorristown, SD
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Morristown, South Dakota, with an average temperature fluctuating between 25.9°F (-3.4°C) and 14.4°F (-9.8°C).Temperature
December is characterized by a clear drop in the average high-temperature, falling from November's cold 41.2°F (5.1°C) to a subzero cold 25.9°F (-3.4°C). Morristown's temperature lowers to a mean of 14.4°F (-9.8°C) during the nights in December.Humidity
In December, the average relative humidity is 82%.Rainfall
In Morristown, in December, during 3.7 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Morristown, during the entire year, the rain falls for 101.3 days and collects up to 14.25" (362mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Morristown, in December, during 12.5 snowfall days, 2.52" (64mm) of snow is typically accumulated. In Morristown, during the entire year, snow falls for 65.8 days and aggregates up to 21.42" (544mm) of snow.Daylight
December has the shortest days of the year in Morristown, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:03 pm. On the last day of December, in Morristown, sunrise is at 7:28 am and sunset at 4:12 pm MST.
Sunshine
In December, the average sunshine is 4.8h.UV index
The month with the lowest UV index in Morristown is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 suggests these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Morristown, SD
- Average high temperature in December: 25.9°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 (25.2°F).
- Average low temperature in December: 14.4°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 (11.7°F).
Average pressure in December
Morristown, SD
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Morristown, SD
- Average wind speed in December: 10.9mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in December
Morristown, SD
- Average humidity in December: 82%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in December
Morristown, SD
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is June (2.28").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Morristown, SD
- Average rainfall days in December: 3.7 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is January (2.9 days).
Average snowfall in December
Morristown, SD
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Morristown, SD
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Morristown, SD
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is August (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Morristown, SD
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Morristown, SD
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Morristown, SD
- Average cloud cover in December: 51
The months with the most cloud cover are January and February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 20).
Average visibility in December
Morristown, 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).
