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
Roslyn's weather undergoes a significant change with the arrival of December, as the average high-temperature drops from a cold 38.8°F (3.8°C) in November to a subzero cold 23.2°F (-4.9°C). Roslyn witnesses a consistent average low-temperature of 11.5°F (-11.4°C) throughout December.Humidity
In December, the average relative humidity is 88%.Rainfall
In Roslyn, in December, it is raining for 4.1 days, with typically 0.98" (25mm) of accumulated precipitation. In Roslyn, during the entire year, the rain falls for 112.9 days and collects up to 22.09" (561mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall in Roslyn is December, when snow falls for 14.6 days and typically aggregates up to 4.53" (115mm) of snow.Daylight
The month with the shortest days in Roslyn is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:50 am and sunset at 4:48 pm. On the last day of December, in Roslyn, sunrise is at 8:09 am and sunset at 4:56 pm CST.
Sunshine
The average sunshine in December is 3.6h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 1 in December leads to these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Frequently asked questions
How cold is December in Roslyn?
What is the average humidity in December in Roslyn?
How much does it rain in Roslyn in December?
What is the snowiest month in Roslyn?
How many days does it snow in December in Roslyn?
What is the month with the shortest days in Roslyn?
What is the average length of the day in December in Roslyn?
When are sunrise and sunset in December in Roslyn?
How many hours of sunshine does Roslyn have in December?
When is the lowest UV index in Roslyn?
What is the UV index intensity in December in Roslyn?
Average temperature in December
Roslyn, SD
- Average high temperature in December: 23.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (18.9°F).
- Average low temperature in December: 11.5°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (5°F).
Average pressure in December
Roslyn, 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
Roslyn, SD
- Average wind speed in December: 11mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).
Average humidity in December
Roslyn, SD
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is September (66%).
Average rainfall in December
Roslyn, SD
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is July (3.58").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in December
Roslyn, SD
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in December
Roslyn, SD
- Average snowfall in December: 4.53"
The month with the highest snowfall is December (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Roslyn, SD
- Average snowfall days in December: 14.6 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Roslyn, 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: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in December
Roslyn, SD
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in December
Roslyn, SD
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Roslyn, SD
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Roslyn, SD
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Roslyn, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location
