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
In Saint Marys, the average high-temperature in May rises, from a refreshing 59.9°F (15.5°C) in April, to a pleasant 69.6°F (20.9°C). Nighttime temperatures consistently average a cool 52.9°F (11.6°C) during May.Humidity
In Saint Marys, the average relative humidity in May is 79%.Rainfall
The month with the most rainfall is May, when the rain falls for 15.9 days and typically aggregates up to 3.07" (78mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Saint Marys aggregates 0.04" (1mm) of snow. Throughout the year, there are 31.9 snowfall days, and 10.12" (257mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 31min.On the first day of the month, sunrise is at 6:11 am and sunset at 8:12 pm. On the last day of May, sunrise is at 5:44 am and sunset at 8:41 pm CDT.
Sunshine
The average sunshine in May is 8.7h.UV index
In Saint Marys, Iowa, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 5 in May interprets into the following advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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?
What is the rainiest month?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When are sunrise and sunset in May?
How long on average sun shines in May?
How high is the UV index in May?
Average temperature in May
Saint Marys, IA
- Average high temperature in May: 69.6°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in May
Saint Marys, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Saint Marys, IA
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in May
Saint Marys, IA
- Average humidity in May: 79%
The months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Saint Marys, IA
- Average rainfall in May: 3.07"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in May
Saint Marys, IA
- Average rainfall days in May: 15.9 days
The months with the highest number of rainy days are May and June (15.9 days).
The month with the least rainy days is January (3.4 days).
Average snowfall in May
Saint Marys, IA
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Saint Marys, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Saint Marys, IA
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in May
Saint Marys, IA
- Average sunshine days in May: 12.1 days
The month with the most sunshine days is December (21.9 days).
The month with the least sunshine days is June (11 days).
Average UV index in May
Saint Marys, IA
- 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 January (UV index 1).
Average cloud cover in May
Saint Marys, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in May
Saint Marys, IA
- 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).
Saint Marys, Iowa, USA
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