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
December marks a distinct drop in the average high-temperature, descending from November's chilly 43.5°F (6.4°C) to a subzero cold 26.4°F (-3.1°C). Rockham observes an average low-temperature of 14.2°F (-9.9°C) during December.Humidity
The average relative humidity in December in Rockham is 84%.Rainfall
In Rockham, in December, during 2.7 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 97.6 rainfall days, and 17.83" (453mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rockham are January through April, October through December. In Rockham, in December, snow falls for 9 days, with typically accumulated 3.23" (82mm) of snow. Throughout the year, there are 43.7 snowfall days, and 18.66" (474mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rockham, with an average of 8h and 54min of daylight.On the first day of December in Rockham, South Dakota, sunrise is at 7:53 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 5:04 pm CST.
Sunshine
In December, the average sunshine is 4.6h.UV index
In Rockham, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 2 during December leads to these advisories:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold is it in Rockham in December?
What is the average humidity in December in Rockham?
How many days does it rain in December in Rockham?
How many days does it snow in December in Rockham?
What is the month with the shortest days in Rockham?
How many hours of daylight does Rockham have in December?
What time are sunrise and sunset in December in Rockham?
How many hours of sunshine does Rockham have in December?
What is the UV index reading in December in Rockham?
Average temperature in December
Rockham, SD
- Average high temperature in December: 26.4°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in December: 14.2°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in December
Rockham, SD
- Average pressure in December: 30.13"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
Rockham, SD
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in December
Rockham, SD
- Average humidity in December: 84%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (60%).
Average rainfall in December
Rockham, SD
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Rockham, SD
- Average rainfall days in December: 2.7 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in December
Rockham, SD
- Average snowfall in December: 3.23"
The month with the highest snowfall is February (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockham, SD
- Average snowfall days in December: 9 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rockham, SD
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Rockham, SD
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (12.2 days).
Average UV index in December
Rockham, 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 and February (UV index 1).
Average cloud cover in December
Rockham, SD
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility in December
Rockham, 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).
Rockham, South Dakota, USA
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