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 brings a temperature rise, moving from a fresh 54.3°F (12.4°C) in April to a refreshing 66°F (18.9°C). In Opal, the expected average low-temperature for May is a chilly 47.8°F (8.8°C).Humidity
In Opal, the average relative humidity in May is 61%.Rainfall
May is the month with the most rainfall in Opal. 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, Opal aggregates 0.79" (20mm) of snow. In Opal, South Dakota, 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 52min.On the first day of the month, sunrise is at 5:37 am and sunset at 7:55 pm. On the last day of May, sunrise is at 5:06 am and sunset at 8:28 pm MDT.
Sunshine
The average sunshine in May in Opal is 9.5h.UV index
In Opal, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 5 in May translates into these instructions:
Act with care - The suggestion to avoid sunburn is emphasized. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Opal in May?
What is the average humidity in May in Opal?
What is the rainiest month in Opal?
How much does it rain in Opal in May?
What is the last month it snows in Opal?
How many hours of daylight does Opal have in May?
When is the sunrise / sunset in May in Opal?
How long on average sun shines in May in Opal?
How high is the UV index in May in Opal?
Average temperature in May
Opal, 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
Opal, 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
Opal, 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
Opal, 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
Opal, 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
Opal, 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
Opal, 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
Opal, 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
Opal, SD
- Average daylight in May: 14h and 5min
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: 9h and 3min
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
Opal, 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
Opal, 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
Opal, 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
Opal, 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).
Opal, South Dakota, USA
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