May weather forecastRoyal City, WA
May
Weather in May
The last month of the spring, May, is an agreeable month in Royal City, Washington, with an average temperature varying between 71.2°F (21.8°C) and 49.1°F (9.5°C).Temperature
As Royal City, Washington, transitions into May, a rise in the average high-temperature is observed, moving from a comfortable 61.3°F (16.3°C) in April to a pleasant 71.2°F (21.8°C). Royal City registers a pronounced decline from daytime peak temperatures, averaging a frosty 49.1°F (9.5°C) lows in May.Humidity
In May, the average relative humidity is 48%.Rainfall
In Royal City, in May, during 8.2 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Royal City, during the entire year, the rain falls for 86.4 days and collects up to 6.38" (162mm) of precipitation.Snowfall
May through August and October are months without snowfall.Daylight
The average length of the day in May is 15h and 5min.On the first day of May, sunrise is at 5:41 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 5:07 am and sunset at 8:45 pm PDT.
Sunshine
In May, the average sunshine in Royal City is 11h.UV index
The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 5 in May translates into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Royal City, WA
- Average high temperature in May: 71.2°F
The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in May: 49.1°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure in May
Royal City, WA
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in May
Royal City, WA
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in May
Royal City, WA
- Average humidity in May: 48%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (37%).
Average rainfall in May
Royal City, WA
- Average rainfall in May: 0.71"
The wettest months (with the highest rainfall) are January and December (0.87").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in May
Royal City, WA
- Average rainfall days in May: 8.2 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in May
Royal City, WA
- Average snowfall in May: 0"
The month with the highest snowfall is December (3.43").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in May
Royal City, 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 and August (0 days).
Average daylight in May /
Average sunshine in May
Royal City, 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 month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in May
Royal City, WA
- Average sunshine days in May: 20.9 days
The months with the most sunshine days are July and August (25.8 days).
The month with the least sunshine days is February (16 days).
Average UV index in May
Royal City, WA
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Royal City, WA
- Average cloud cover in May: 25
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in May
Royal City, WA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
