May weather forecastUmtanum, WA
May
Weather in May
May, the last month of the spring in Umtanum, is a refreshing month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 43.3°F (6.3°C).Temperature
May shows a rise in the average high-temperature, moving from April's cool 54.5°F (12.5°C) to an enjoyable 64.9°F (18.3°C). Despite the drastic temperature difference, Umtanum records an average nighttime low of 43.3°F (6.3°C) throughout May.Humidity
The average relative humidity in May is 58%.Rainfall
In Umtanum, Washington, in May, it is raining for 9.6 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 99.9 rainfall days, and 8.66" (220mm) of precipitation is accumulated.Snowfall
May through August are months without snowfall in Umtanum.Daylight
The average length of the day in May is 15h and 5min.On the first day of the month, sunrise is at 5:45 am and sunset at 8:12 pm. On the last day of May, sunrise is at 5:11 am and sunset at 8:48 pm PDT.
Sunshine
In Umtanum, the average sunshine in May is 11h.UV index
In May, the average daily maximum UV index in Umtanum is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A daily high UV index of 4 in May leads to these guidelines:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Umtanum, WA
- Average high temperature in May: 64.9°F
The warmest months (with the highest average high temperature) are July and August (82°F).
The month with the lowest average high temperature is December (33.3°F).
- Average low temperature in May: 43.3°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure in May
Umtanum, WA
- Average pressure in May: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in May
Umtanum, WA
- Average wind speed in May: 7.7mph
The windiest month (with the highest average wind speed) is June (8.9mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in May
Umtanum, WA
- Average humidity in May: 58%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall in May
Umtanum, WA
- Average rainfall in May: 0.91"
The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in May
Umtanum, WA
- Average rainfall days in May: 9.6 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in May
Umtanum, WA
- Average snowfall in May: 0"
The month with the highest snowfall is December (4.65").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in May
Umtanum, WA
- Average snowfall days in May: 0 days
The months with the highest number of snowfall days are January and December (8.7 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Umtanum, WA
- Average daylight in May: 15h and 6min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in May: 11h and 0min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 48min).
Average sunshine days in May
Umtanum, WA
- Average sunshine days in May: 19.6 days
The month with the most sunshine days is July (27.1 days).
The month with the least sunshine days is February (13.5 days).
Average UV index in May
Umtanum, 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, February, March, November and December (UV index 2).
Average cloud cover in May
Umtanum, WA
- Average cloud cover in May: 26
The month with the most cloud cover is January (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in May
Umtanum, WA
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
