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 changeover to May signals a significant increase in the average high-temperature, rising from a frosty 46.9°F (8.3°C) in April to an enjoyable 63.3°F (17.4°C). An average low-temperature of 43°F (6.1°C) is observed during the May nights.Humidity
With an average relative humidity of 71%, May is the least humid month.Rainfall
The month with the most rainfall is May, when the rain falls for 16 days and typically aggregates up to 3.15" (80mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 1.6 snowfall days, in May, Mercer aggregates 1.34" (34mm) of snow. In Mercer, during the entire year, snow falls for 120.8 days and aggregates up to 54.92" (1395mm) of snow.Daylight
In May, the average length of the day is 15h and 0min.On the first day of the month, sunrise is at 5:45 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:12 am and sunset at 8:43 pm CDT.
Sunshine
The average sunshine in May is 8.4h.UV index
In Mercer, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In May, the maximum UV index of 4 suggests this advice:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. 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
What is the temperature in May?
What is the least humid month?
What is the average humidity in May?
What is the rainiest month?
How much 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
Mercer, WI
- Average high temperature in May: 63.3°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (18.3°F).
- Average low temperature in May: 43°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (7°F).
Average pressure in May
Mercer, WI
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Mercer, WI
- Average wind speed in May: 7.8mph
The windiest month (with the highest average wind speed) is November (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in May
Mercer, WI
- Average humidity in May: 71%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (71%).
Average rainfall in May
Mercer, WI
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days in May
Mercer, WI
- Average rainfall days in May: 16 days
The months with the highest number of rainy days are May and June (16 days).
The month with the least rainy days is January (3 days).
Average snowfall in May
Mercer, WI
- Average snowfall in May: 1.34"
The month with the highest snowfall is December (10.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Mercer, WI
- Average snowfall days in May: 1.6 days
The month with the highest number of snowfall days is January (25.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mercer, WI
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- 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: 1h and 54min).
Average sunshine days in May
Mercer, WI
- Average sunshine days in May: 11.5 days
The month with the most sunshine days is August (14.3 days).
The month with the least sunshine days is January (6.3 days).
Average UV index in May
Mercer, WI
- Average UV index in May: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in May
Mercer, WI
- Average cloud cover in May: 46
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in May
Mercer, WI
- Average visibility in May: 6mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February and December (4mi).
Mercer, Wisconsin, USA
Weather forecast for your location
2. Allow the app to use your location