Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May's onset witnesses a shift in the average high-temperature, moving from a cool 51.8°F (11°C) in April to a comfortable 65.7°F (18.7°C). Hecla records a consistent low-temperature of 48.2°F (9°C) during May nights.Humidity
In May, the average relative humidity is 66%.Rainfall
In Hecla, in May, it is raining for 15.2 days, with typically 2.52" (64mm) of accumulated precipitation. In Hecla, during the entire year, the rain falls for 109.5 days and collects up to 20.39" (518mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.4 snowfall days, in May, Hecla aggregates 0.24" (6mm) of snow. In Hecla, during the entire year, snow falls for 68.5 days and aggregates up to 22.83" (580mm) of snow.Daylight
In Hecla, the average length of the day in May is 14h and 58min.On the first day of May, sunrise is at 6:18 am and sunset at 8:40 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 9:15 pm CDT.
Sunshine
The average sunshine in May is 9h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 5 in May transforms into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the average humidity in May?
How much does it rain in May?
What is the last month it snows in Hecla?
How many hours of daylight does Hecla have in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Hecla have in May?
What is the UV index reading in May?
Average temperature in May
Hecla, SD
- Average high temperature in May: 65.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (19°F).
- Average low temperature in May: 48.2°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in May
Hecla, SD
- Average pressure in May: 29.93"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 May
Hecla, SD
- Average wind speed in May: 9.9mph
The windiest month (with the highest average wind speed) is October (10.8mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in May
Hecla, SD
- Average humidity in May: 66%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are August and September (62%).
Average rainfall in May
Hecla, SD
- Average rainfall in May: 2.52"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days in May
Hecla, SD
- Average rainfall days in May: 15.2 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (2.4 days).
Average snowfall in May
Hecla, SD
- Average snowfall in May: 0.24"
The month with the highest snowfall is December (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Hecla, SD
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Hecla, SD
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Hecla, SD
- Average sunshine days in May: 12.3 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in May
Hecla, SD
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in May
Hecla, SD
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in May
Hecla, SD
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
Hecla, South Dakota, USA
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