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 sees a rise in the average high-temperature, jumping from April's fresh 50.4°F (10.2°C) to a refreshing 61.3°F (16.3°C). Mount Vernon experiences a substantial decline from the daytime high temperatures in May, settling on an average low of 36.1°F (2.3°C).Humidity
In Mount Vernon, the average relative humidity in May is 63%.Rainfall
In Mount Vernon, during May, the rain falls for 14.8 days and regularly aggregates up to 1.65" (42mm) of precipitation. In Mount Vernon, during the entire year, the rain falls for 127.7 days and collects up to 17.09" (434mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. May is the last month it regularly snows. During 1.3 snowfall days, in May, Mount Vernon aggregates 0.28" (7mm) of snow. In Mount Vernon, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.Daylight
In May, the average length of the day is 14h and 49min.On the first day of May, sunrise is at 5:45 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 5:15 am and sunset at 8:33 pm PDT.
Sunshine
In Mount Vernon, the average sunshine in May is 10.8h.UV index
The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 4 during May morphs into the following directions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Mount Vernon in May?
What is the average humidity in May?
How much 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 Mount Vernon have in May?
What is the UV index intensity in May?
Average temperature in May
Mount Vernon, OR
- Average high temperature in May: 61.3°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (33.4°F).
- Average low temperature in May: 36.1°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (19.6°F).
Average pressure in May
Mount Vernon, OR
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in May
Mount Vernon, OR
- Average wind speed in May: 5.7mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).
Average humidity in May
Mount Vernon, OR
- Average humidity in May: 63%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (42%).
Average rainfall in May
Mount Vernon, OR
- Average rainfall in May: 1.65"
The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Mount Vernon, OR
- Average rainfall days in May: 14.8 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in May
Mount Vernon, OR
- Average snowfall in May: 0.28"
The month with the highest snowfall is February (10.31").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Mount Vernon, OR
- Average snowfall days in May: 1.3 days
The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Mount Vernon, OR
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 10h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in May
Mount Vernon, OR
- Average sunshine days in May: 13.8 days
The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is February (9 days).
Average UV index in May
Mount Vernon, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in May
Mount Vernon, OR
- Average cloud cover in May: 31
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in May
Mount Vernon, OR
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Mount Vernon, Oregon, USA
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