May weather forecastSwan, IA
May
Weather in May
The last month of the spring, May, is an agreeable month in Swan, Iowa, with an average temperature varying between 52.9°F (11.6°C) and 69.8°F (21°C).Temperature
An escalation in the average high-temperature is seen with the onset of May, moving from a mild 59.7°F (15.4°C) in April to an agreeable 69.8°F (21°C). During May, the temperature is averaged to a low of 52.9°F (11.6°C) at night.Humidity
The average relative humidity in May is 79%.Rainfall
May is the month with the most rainfall. Rain falls for 15.3 days and accumulates 2.28" (58mm) of precipitation.Snowfall
In Swan, snow does not fall in May through September.Daylight
The average length of the day in May is 14h and 32min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:11 pm. On the last day of May, sunrise is at 5:41 am and sunset at 8:40 pm CDT.
Sunshine
In Swan, the average sunshine in May is 8.7h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 5 in May translates into these instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Swan, IA
- Average high temperature in May: 69.8°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in May
Swan, 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
Swan, IA
- Average wind speed in May: 8.8mph
The windiest months (with the highest average wind speed) are January and April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in May
Swan, IA
- Average humidity in May: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Swan, IA
- Average rainfall in May: 2.28"
The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and December (0.39").
Average rainfall days in May
Swan, IA
- 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
Swan, IA
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.97").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Swan, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Swan, IA
- Average daylight in May: 14h and 30min
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 12min).
- Average sunshine in May: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in May
Swan, IA
- Average sunshine days in May: 12.8 days
The month with the most sunshine days is December (22.7 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in May
Swan, 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
Swan, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in May
Swan, IA
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
