May weather forecastMellette, SD
May
Weather in May
The last month of the spring, May, is a comfortable month in Mellette, South Dakota, with an average temperature fluctuating between 48.2°F (9°C) and 66.7°F (19.3°C).Temperature
As April transitions into May, a change in temperatures is observed, with average highs moving from a cool 54.1°F (12.3°C) to a refreshing 66.7°F (19.3°C). Mellette records an average nighttime low of 48.2°F (9°C) in May.Humidity
The average relative humidity in May is 66%.Rainfall
In Mellette, in May, it is raining for 13 days, with typically 2.32" (59mm) of accumulated precipitation. In Mellette, South Dakota, during the entire year, the rain falls for 97.2 days and collects up to 18.35" (466mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.3 snowfall days, in May, Mellette aggregates 0.08" (2mm) of snow. In Mellette, during the entire year, snow falls for 54.8 days and aggregates up to 19.13" (486mm) of snow.Daylight
The average length of the day in May is 14h and 53min.On the first day of the month, sunrise is at 6:21 am and sunset at 8:40 pm. On the last day of May, in Mellette, sunrise is at 5:49 am and sunset at 9:13 pm CDT.
Sunshine
In Mellette, the average sunshine in May is 9h.UV index
The average daily maximum UV index in May in Mellette is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 5 in May interprets into the following advice:
Put precautions into practice - Guidance to elude sunburn is provided. To protect against the Sun's most potent rays, avoid direct exposure around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Mellette, SD
- Average high temperature in May: 66.7°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (20.7°F).
- Average low temperature in May: 48.2°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure in May
Mellette, SD
- Average pressure in May: 29.92"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
Mellette, SD
- Average wind speed in May: 9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in May
Mellette, SD
- Average humidity in May: 66%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (60%).
Average rainfall in May
Mellette, SD
- Average rainfall in May: 2.32"
The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in May
Mellette, SD
- Average rainfall days in May: 13 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2 days).
Average snowfall in May
Mellette, SD
- Average snowfall in May: 0.08"
The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Mellette, SD
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mellette, 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 0min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Mellette, SD
- Average sunshine days in May: 15.7 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12.7 days).
Average UV index in May
Mellette, SD
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in May
Mellette, SD
- Average cloud cover in May: 39
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility in May
Mellette, SD
- Average visibility in May: 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).
