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
Ontario's weather shows a temperature rise with the arrival of May, moving from a cool 53.1°F (11.7°C) in April to a comfortable 65.8°F (18.8°C). Ontario records an average low-temperature of 47.5°F (8.6°C) throughout the month of May.Humidity
The average relative humidity in May is 79%.Rainfall
In Ontario, in May, during 17.5 rainfall days, 3.39" (86mm) of precipitation is typically accumulated. Throughout the year, in Ontario, there are 131.7 rainfall days, and 27.83" (707mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.3 snowfall days, in May, Ontario aggregates 0.04" (1mm) of snow. In Ontario, during the entire year, snow falls for 50.2 days and aggregates up to 21.69" (551mm) of snow.Daylight
In May, the average length of the day is 14h and 45min.On the first day of May, sunrise is at 5:53 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:36 pm CDT.
Sunshine
The average sunshine in May is 8.4h.UV index
In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 5 during May morphs into the following directions:
Exercise prevention - Warding off sunburn is urged. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature?
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?
What time are sunrise and sunset in May?
How many hours of sunshine does Ontario have in May?
What is the UV index reading in May?
Average temperature in May
Ontario, WI
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (22.1°F).
- Average low temperature in May: 47.5°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in May
Ontario, WI
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Ontario, WI
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in May
Ontario, WI
- Average humidity in May: 79%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is April (77%).
Average rainfall in May
Ontario, WI
- Average rainfall in May: 3.39"
The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in May
Ontario, WI
- Average rainfall days in May: 17.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (3.5 days).
Average snowfall in May
Ontario, WI
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Ontario, WI
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Ontario, WI
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- 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 0min).
Average sunshine days in May
Ontario, WI
- Average sunshine days in May: 11.9 days
The month with the most sunshine days is December (17.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in May
Ontario, WI
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in May
Ontario, WI
- Average cloud cover in May: 45
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in May
Ontario, WI
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, October and November (6mi).
The month with the lowest visibility is January (4mi).
Ontario, Wisconsin, USA
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