December weather forecastOnaka, SD
December
Weather in December
December, the first month of the winter in Onaka, is still a freezing cold month, with temperature in the range of an average high of 25.5°F (-3.6°C) and an average low of 14.2°F (-9.9°C).Temperature
December's onset is marked by a clear temperature decrease, falling from a cold 41.9°F (5.5°C) in November to a freezing cold 25.5°F (-3.6°C). During the nights in December, Onaka observes an average low-temperature of 14.2°F (-9.9°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In Onaka, during December, the rain falls for 3.3 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, there are 97.8 rainfall days, and 16.65" (423mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Onaka, in December, snow falls for 11.2 days, with typically accumulated 2.91" (74mm) of snow. Throughout the year, there are 59.7 snowfall days, and 19.96" (507mm) of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:57 am and sunset at 4:57 pm. On the last day of December, sunrise is at 8:16 am and sunset at 5:05 pm CST.
Sunshine
In Onaka, the average sunshine in December is 4.4h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a regular UV index of 1 translates into these guidelines:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Beware! Reflection from snow can magnify 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
Onaka, SD
- Average high temperature in December: 25.5°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (22.6°F).
- Average low temperature in December: 14.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in December
Onaka, SD
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Onaka, SD
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is April (11.8mph).
The calmest month (with the lowest average wind speed) is August (9.7mph).
Average humidity in December
Onaka, SD
- Average humidity in December: 84%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (56%).
Average rainfall in December
Onaka, SD
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in December
Onaka, SD
- Average rainfall days in December: 3.3 days
The month with the highest number of rainy days is June (14.4 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in December
Onaka, SD
- Average snowfall in December: 2.91"
The month with the highest snowfall is February (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Onaka, SD
- Average snowfall days in December: 11.2 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Onaka, SD
- Average daylight in December: 8h and 48min
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 24min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Onaka, SD
- Average sunshine days in December: 17.8 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in December
Onaka, SD
- Average UV index in December: 1
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 1).
Average cloud cover in December
Onaka, SD
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 22).
Average visibility in December
Onaka, 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).
