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
A rise in the average high-temperature is observed during May, moving from a fresh 54°F (12.2°C) in April to an enjoyable 65.7°F (18.7°C). Throughout the month of May, Decorah observes an average nighttime temperature of 48.7°F (9.3°C).Humidity
In Decorah, the average relative humidity in May is 81%.Rainfall
In Decorah, during May, the rain falls for 20.3 days and regularly aggregates up to 4.06" (103mm) of precipitation. In Decorah, during the entire year, the rain falls for 149 days and collects up to 30.59" (777mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.4 snowfall days, in May, Decorah aggregates 0.16" (4mm) of snow. In Decorah, during the entire year, snow falls for 60.9 days and aggregates up to 24.37" (619mm) of snow.Daylight
In Decorah, Iowa, the average length of the day in May is 14h and 43min.On the first day of the month, sunrise is at 5:58 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:29 am and sunset at 8:40 pm CDT.
Sunshine
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 estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 5 in May translates into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Decorah?
What is the average humidity in May in Decorah?
How much does it rain in Decorah in May?
What is the last month it snows in Decorah?
What is the average length of the day in May in Decorah?
When is the sunrise / sunset in May in Decorah?
How long on average sun shines in May in Decorah?
When is the highest UV index in Decorah?
What is the UV index intensity in May in Decorah?
Average temperature in May
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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
Decorah, 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).
Decorah, Iowa, USA
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