May weather forecastSpearfish, SD
May
Weather in May
May in Spearfish generates a noticeable transition away from spring-like conditions towards early summer weather. Above 50s°F noted in April are replaced by balmy highs of 61.9°F (16.6°C). The month bids farewell to snowfall, setting the stage for uninterrupted rainfall periods. These warmer balmy conditions coupled with extended daylight hours foster an environment conducive to outdoor activities. With the drop in wind speeds, May offers pleasant climatic conditions to enjoy the onset of summer.Temperature
With the onset of May, Spearfish's average high-temperature experiences a rise, moving from April's fresh 51.4°F (10.8°C) to an enjoyable 61.9°F (16.6°C). During May, Spearfish experiences a consistent low-temperature average of 43.2°F (6.2°C).Humidity
In May, the average relative humidity is 66%.Rainfall
The month with the most rainfall in Spearfish is May, when the rain falls for 15.6 days and typically aggregates up to 2.32" (59mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. May is the last month it regularly snows. During 2.2 snowfall days, in May, Spearfish aggregates 2.64" (67mm) of snow. In Spearfish, during the entire year, snow falls for 56.8 days and aggregates up to 36.3" (922mm) of snow.Daylight
In May, the average length of the day in Spearfish is 14h and 49min.On the first day of the month, sunrise is at 5:44 am and sunset at 8:00 pm. On the last day of May, in Spearfish, sunrise is at 5:13 am and sunset at 8:32 pm MDT.
Sunshine
In Spearfish, South Dakota, the average sunshine in May is 10h.UV index
In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily high UV index of 5 in May leads to these guidelines:
Take necessary precautions - Defending against sun damage is advocated. To protect against the Sun's most potent rays, avoid direct exposure around midday. Enhance your sun protection with tightly woven, yet airy clothing. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Spearfish, SD
- Average high temperature in May: 61.9°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 May: 43.2°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 May
Spearfish, SD
- Average pressure in May: 29.91"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 May
Spearfish, SD
- Average wind speed in May: 9.1mph
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 May
Spearfish, SD
- Average humidity in May: 66%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (49%).
Average rainfall in May
Spearfish, SD
- Average rainfall in May: 2.32"
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 May
Spearfish, SD
- Average rainfall days in May: 15.6 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 May
Spearfish, SD
- Average snowfall in May: 2.64"
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 May
Spearfish, SD
- Average snowfall days in May: 2.2 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 May /
Average sunshine in May
Spearfish, SD
- Average daylight in May: 14h and 48min
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 May: 10h and 0min
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 May
Spearfish, SD
- Average sunshine days in May: 12.7 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 May
Spearfish, SD
- Average UV index in May: 5
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 May
Spearfish, SD
- Average cloud cover in May: 34
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 May
Spearfish, SD
- Average visibility in May: 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).
