May weather forecastIsabel, SD
May
Weather in May
The last month of the spring, May, is a refreshing month in Isabel, South Dakota, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 66°F (18.9°C).Temperature
May witnesses an increase in the average high-temperature, moving from a cool 54.3°F (12.4°C) in April to a comfortable 66°F (18.9°C). During May nights, Isabel records an average temperature of 47.8°F (8.8°C).Humidity
In Isabel, the average relative humidity in May is 61%.Rainfall
May is the month with the most rainfall. Rain falls for 14.7 days and accumulates 2.83" (72mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.9 snowfall days, in May, Isabel aggregates 0.79" (20mm) of snow. In Isabel, during the entire year, snow falls for 58.3 days and aggregates up to 22.95" (583mm) of snow.Daylight
In May, the average length of the day is 14h and 55min.On the first day of the month, sunrise is at 5:32 am and sunset at 7:52 pm. On the last day of May, sunrise is at 5:00 am and sunset at 8:26 pm MDT.
Sunshine
In Isabel, the average sunshine in May is 9.5h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: An average maximum UV index of 5 in May leads to these recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Isabel, SD
- Average high temperature in May: 66°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in May: 47.8°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in May
Isabel, SD
- Average pressure in May: 29.92"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in May
Isabel, SD
- Average wind speed in May: 11.6mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest months (with the lowest average wind speed) are February and August (10.4mph).
Average humidity in May
Isabel, SD
- Average humidity in May: 61%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall in May
Isabel, SD
- Average rainfall in May: 2.83"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in May
Isabel, SD
- Average rainfall days in May: 14.7 days
The month with the highest number of rainy days is May (14.7 days).
The months with the least rainy days are January and February (3.3 days).
Average snowfall in May
Isabel, SD
- Average snowfall in May: 0.79"
The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Isabel, SD
- Average snowfall days in May: 0.9 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Isabel, SD
- Average daylight in May: 14h and 54min
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 May: 9h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in May
Isabel, SD
- Average sunshine days in May: 13.6 days
The month with the most sunshine days is September (20.4 days).
The month with the least sunshine days is April (12.4 days).
Average UV index in May
Isabel, SD
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Isabel, SD
- Average cloud cover in May: 36
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 19).
Average visibility in May
Isabel, 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).
