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
May's arrival coincides with a rise in the average high-temperature, moving from April's frosty 49.5°F (9.7°C) to a refreshing 60.6°F (15.9°C). Throughout the month of May, Ontario witnesses an average low-temperature of 48.6°F (9.2°C).Humidity
In May, the average relative humidity in Ontario is 78%.Rainfall
In May, the rain falls for 16.8 days. Throughout May, 3.15" (80mm) of precipitation is accumulated. Throughout the year, in Ontario, there are 167.9 rainfall days, and 31.18" (792mm) of precipitation is accumulated.Snowfall
Months with snowfall in Ontario are January through May, October through December. May is the last month it regularly snows. During 0.4 snowfall days, in May, Ontario aggregates 0.35" (9mm) of snow. In Ontario, during the entire year, snow falls for 62.3 days and aggregates up to 20.63" (524mm) of snow.Daylight
In May, the average length of the day in Ontario is 14h and 42min.On the first day of May in Ontario, sunrise is at 6:01 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:41 pm EDT.
Sunshine
The average sunshine in May in Ontario is 9.4h.UV index
In Ontario, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 5 during May translates into the following directions:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Ontario in May?
What is the average humidity in May in Ontario?
How many days does it rain in May in Ontario?
What is the last month it snows in Ontario?
How many hours of daylight does Ontario have in May?
When is the sunrise / sunset in May in Ontario?
How many hours of sunshine does Ontario have in May?
How high is the UV index in May in Ontario?
Average temperature in May
Ontario, NY
- Average high temperature in May: 60.6°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in May: 48.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in May
Ontario, NY
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Ontario, NY
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (13.2mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in May
Ontario, NY
- Average humidity in May: 78%
The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are August and September (75%).
Average rainfall in May
Ontario, NY
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is October (3.23").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in May
Ontario, NY
- Average rainfall days in May: 16.8 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in May
Ontario, NY
- Average snowfall in May: 0.35"
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
Ontario, NY
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (15.4 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, NY
- 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: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in May
Ontario, NY
- Average sunshine days in May: 12.4 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in May
Ontario, NY
- Average UV index in May: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Ontario, NY
- Average cloud cover in May: 38
The month with the most cloud cover is January (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in May
Ontario, NY
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Ontario, New York, USA
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