May weather forecastMountain Brook, WA
May
Weather in May
May, the last month of the spring in Mountain Brook, is a refreshing month, with an average temperature varying between 41.4°F (5.2°C) and 62.8°F (17.1°C).Temperature
An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a fresh 52.5°F (11.4°C) to a refreshing 62.8°F (17.1°C). Mountain Brook encounters an average low-temperature of 41.4°F (5.2°C) during May nights.Humidity
The average relative humidity in May is 68%.Rainfall
In Mountain Brook, Washington, during May, the rain falls for 12.8 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 152.5 rainfall days, and 26.93" (684mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in May is 14h and 58min.On the first day of May, sunrise is at 5:51 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 8:47 pm PDT.
Sunshine
The average sunshine in May is 10.1h.UV index
The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In May, the average maximum UV index of 4 translates into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Mountain Brook, WA
- Average high temperature in May: 62.8°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in May: 41.4°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).
Average pressure in May
Mountain Brook, WA
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in May
Mountain Brook, WA
- Average wind speed in May: 5.9mph
The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in May
Mountain Brook, WA
- Average humidity in May: 68%
The months with the highest relative humidity are January, February and December (88%).
The months with the lowest relative humidity are July and August (58%).
Average rainfall in May
Mountain Brook, WA
- Average rainfall in May: 1.38"
The wettest month (with the highest rainfall) is January (4.88").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Mountain Brook, WA
- Average rainfall days in May: 12.8 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in May
Mountain Brook, WA
- Average snowfall in May: 0"
The month with the highest snowfall is January (6.22").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Mountain Brook, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is December (6.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Mountain Brook, WA
- 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: 10h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Mountain Brook, WA
- Average sunshine days in May: 16.5 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in May
Mountain Brook, WA
- 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 and February (UV index 1).
Average cloud cover in May
Mountain Brook, WA
- Average cloud cover in May: 37
The months with the most cloud cover are January and February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in May
Mountain Brook, WA
- Average visibility in May: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
