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 moderate 56.3°F (13.5°C) in April to a comfortable 67.8°F (19.9°C). In Iona, an average nighttime temperature of 49.3°F (9.6°C) is expected during May.Humidity
The average relative humidity in May is 66%.Rainfall
In Iona, in May, during 15.3 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. In Iona, during the entire year, the rain falls for 107.6 days and collects up to 17.83" (453mm) of precipitation.Snowfall
In Iona, South Dakota, snow does not fall in May through September.Daylight
In Iona, the average length of the day in May is 14h and 44min.On the first day of the month, sunrise is at 6:28 am and sunset at 8:40 pm. On the last day of May, in Iona, South Dakota, sunrise is at 5:59 am and sunset at 9:11 pm CDT.
Sunshine
In Iona, the average sunshine in May is 9.5h.UV index
The average daily maximum UV index in May in Iona is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In May, the maximum UV index of 5 translates into these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Experience reduced UV exposure by about half when donning a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the temperature in May in Iona?
What is the average humidity in May in Iona?
How many days does it rain in May in Iona?
When it does not snow in Iona?
Does it snow in Iona in May?
How many hours of daylight does Iona have in May?
What time are sunrise and sunset in May in Iona?
How many hours of sunshine does Iona have in May?
What is the UV index reading in May in Iona?
Average temperature in May
Iona, SD
- Average high temperature in May: 67.8°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in May: 49.3°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in May
Iona, SD
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in May
Iona, SD
- Average wind speed in May: 10.4mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (9.1mph).
Average humidity in May
Iona, SD
- Average humidity in May: 66%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is September (58%).
Average rainfall in May
Iona, SD
- Average rainfall in May: 2.8"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is November (0.55").
Average rainfall days in May
Iona, SD
- Average rainfall days in May: 15.3 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in May
Iona, SD
- Average snowfall in May: 0"
The month with the highest snowfall is February (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Iona, SD
- Average snowfall days in May: 0.1 days
The months with the highest number of snowfall days are January and February (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Iona, SD
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in May: 9h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in May
Iona, SD
- Average sunshine days in May: 12.1 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in May
Iona, SD
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Iona, SD
- Average cloud cover in May: 36
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in May
Iona, 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).
Iona, South Dakota, USA
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