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 May, the average high-temperature increases from a mild 56.8°F (13.8°C) in April to an agreeable 68.2°F (20.1°C). Waterloo witnesses an average low-temperature of 51.6°F (10.9°C) throughout the month of May.Humidity
The average relative humidity in May in Waterloo is 77%.Rainfall
In Waterloo, during May, the rain falls for 17.1 days and regularly aggregates up to 4.21" (107mm) of precipitation. Throughout the year, in Waterloo, there are 133.6 rainfall days, and 28.27" (718mm) of precipitation is accumulated.Snowfall
Months with snowfall in Waterloo are January through May, October through December. May is the last month it regularly snows in Waterloo. During 0.3 snowfall days, in May, Waterloo aggregates 0.2" (5mm) of snow. Throughout the year, there are 41.6 snowfall days, and 15.24" (387mm) of snow is accumulated.Daylight
In Waterloo, the average length of the day in May is 14h and 38min.On the first day of the month, sunrise is at 6:03 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:34 am and sunset at 8:39 pm CDT.
Sunshine
The average sunshine in May in Waterloo, Iowa, is 8.4h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In May, an average UV index of 5 transforms into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Waterloo?
What is the average humidity in May in Waterloo?
How many days does it rain in May in Waterloo?
What is the last month it snows in Waterloo?
What is the average length of the day in May in Waterloo?
What time are sunrise and sunset in May in Waterloo?
How long on average sun shines in May in Waterloo?
How high is the UV index in May in Waterloo?
Average temperature in May
Waterloo, IA
- Average high temperature in May: 68.2°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in May: 51.6°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in May
Waterloo, IA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Waterloo, IA
- Average wind speed in May: 9.3mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in May
Waterloo, IA
- Average humidity in May: 77%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Waterloo, IA
- Average rainfall in May: 4.21"
The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in May
Waterloo, IA
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).
Average snowfall in May
Waterloo, IA
- Average snowfall in May: 0.2"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Waterloo, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Waterloo, IA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in May
Waterloo, IA
- Average sunshine days in May: 12.8 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).
Average UV index in May
Waterloo, IA
- Average UV index in May: 5
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Waterloo, IA
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in May
Waterloo, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Waterloo, Iowa, USA
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