Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January's average high-temperature in Spearfish stands at a still freezing cold 31.5°F (-0.3°C), showing little deviation from December's 30.9°F (-0.6°C). Spearfish in January experiences a low-temperature average of 18.5°F (-7.5°C).Humidity
January is the most humid month, with an average relative humidity of 79%.Rainfall
The month with the least rainfall is January, when the rain falls for 3 days and typically collects 0.59" (15mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Spearfish, South Dakota, in January, snow falls for 9.7 days, with typically accumulated 3.31" (84mm) of snow. Throughout the year, there are 56.8 snowfall days, and 36.3" (922mm) of snow is accumulated.Daylight
In Spearfish, the average length of the day in January is 9h and 17min.On the first day of January in Spearfish, sunrise is at 7:31 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:02 pm MST.
Sunshine
In Spearfish, the average sunshine in January is 5.8h.UV index
The months with the lowest UV index are January, February, April, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. 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
How cold is January in Spearfish?
What is the most humid month in Spearfish?
What is the average humidity in January in Spearfish?
What is the driest month in Spearfish?
How many days does it rain in January in Spearfish?
How many days does it snow in January in Spearfish?
How many hours of daylight does Spearfish have in January?
When is the sunrise / sunset in January in Spearfish?
How many hours of sunshine does Spearfish have in January?
What are the months with the lowest UV index in Spearfish?
What is the UV index intensity in January in Spearfish?
Average temperature in January
Spearfish, SD
- Average high temperature in January: 31.5°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in January: 18.5°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).
Average pressure in January
Spearfish, SD
- Average pressure in January: 30.14"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 January
Spearfish, SD
- Average wind speed in January: 10.2mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in January
Spearfish, SD
- Average humidity in January: 79%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (49%).
Average rainfall in January
Spearfish, SD
- Average rainfall in January: 0.59"
The wettest month (with the highest rainfall) is May (2.32").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in January
Spearfish, SD
- Average rainfall days in January: 3 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in January
Spearfish, SD
- Average snowfall in January: 3.31"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are June, July and August (0").
Average snowfall days in January
Spearfish, SD
- Average snowfall days in January: 9.7 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in January /
Average sunshine in January
Spearfish, SD
- Average daylight in January: 9h and 2min
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 January: 5h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in January
Spearfish, SD
- Average sunshine days in January: 18.3 days
The month with the most sunshine days is November (20.3 days).
The month with the least sunshine days is May (12.7 days).
Average UV index in January
Spearfish, SD
- Average UV index in January: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
Average cloud cover in January
Spearfish, SD
- Average cloud cover in January: 40
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in January
Spearfish, SD
- Average visibility in January: 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).
Spearfish, South Dakota, USA
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