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
The arrival of May brings an increase in high-temperatures, moving from a cool 54°F (12.2°C) in April to a comfortable 65.7°F (18.7°C). The average temperature during May nights is registered at a chilly 48.7°F (9.3°C).Humidity
In Spillville, the average relative humidity in May is 81%.Rainfall
In Spillville, in May, it is raining for 20.3 days, with typically 4.06" (103mm) of accumulated precipitation. Throughout the year, there are 149 rainfall days, and 30.59" (777mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.4 snowfall days, in May, Spillville aggregates 0.16" (4mm) of snow. In Spillville, during the entire year, snow falls for 60.9 days and aggregates up to 24.37" (619mm) of snow.Daylight
In May, the average length of the day in Spillville is 14h and 42min.On the first day of May, sunrise is at 5:59 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 5:30 am and sunset at 8:40 pm CDT.
Sunshine
In Spillville, the average sunshine in May is 8.2h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 5 during May leads to these instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May?
What is the average humidity in May?
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?
When is the highest UV index?
What is the UV index intensity in May?
Average temperature in May
Spillville, IA
- Average high temperature in May: 65.7°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (22.3°F).
- Average low temperature in May: 48.7°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in May
Spillville, IA
- Average pressure in May: 29.94"Hg
The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Spillville, IA
- Average wind speed in May: 9mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in May
Spillville, IA
- Average humidity in May: 81%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).
Average rainfall in May
Spillville, IA
- Average rainfall in May: 4.06"
The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in May
Spillville, IA
- Average rainfall days in May: 20.3 days
The months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in May
Spillville, IA
- Average snowfall in May: 0.16"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Spillville, IA
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Spillville, IA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in May: 8h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in May
Spillville, IA
- Average sunshine days in May: 8.2 days
The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).
Average UV index in May
Spillville, IA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in May
Spillville, IA
- Average cloud cover in May: 45
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Spillville, IA
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).
Spillville, Iowa, USA
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