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 subtle temperature rise, moving from April's refreshing 55.9°F (13.3°C) to an enjoyable 64.4°F (18°C). A marked drop from daytime peak temperatures to an average low-temperature of 40.6°F (4.8°C) is observed during the nights in May in Castle Rock.Humidity
In May, the average relative humidity is 79%.Rainfall
In Castle Rock, in May, it is raining for 13.3 days, with typically 1.22" (31mm) of accumulated precipitation. In Castle Rock, during the entire year, the rain falls for 157.3 days and collects up to 16.54" (420mm) of precipitation.Snowfall
In Castle Rock, Washington, snow does not fall in April through October.Daylight
In Castle Rock, the average length of the day in May is 15h and 1min.On the first day of May, sunrise is at 5:56 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:55 pm PDT.
Sunshine
The average sunshine in May in Castle Rock is 7.9h.UV index
In Castle Rock, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In May, the maximum UV index of 4 suggests these recommendations:
Ensure safety - Sun damage prevention is strongly urged. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Castle Rock?
What is the average humidity in May in Castle Rock?
How much does it rain in Castle Rock in May?
When it does not snow in Castle Rock?
What is the average length of the day in May in Castle Rock?
When are sunrise and sunset in May in Castle Rock?
How many hours of sunshine does Castle Rock have in May?
How high is the UV index in May in Castle Rock?
Average temperature in May
Castle Rock, WA
- Average high temperature in May: 64.4°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (42.4°F).
- Average low temperature in May: 40.6°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 (32.5°F).
Average pressure in May
Castle Rock, WA
- Average pressure in May: 30.04"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in May
Castle Rock, WA
- Average wind speed in May: 4mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.7mph).
Average humidity in May
Castle Rock, WA
- Average humidity in May: 79%
The months with the highest relative humidity are February and November (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in May
Castle Rock, WA
- Average rainfall in May: 1.22"
The wettest month (with the highest rainfall) is January (2.28").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in May
Castle Rock, WA
- Average rainfall days in May: 13.3 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in May
Castle Rock, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Castle Rock, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.4 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
Castle Rock, 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: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in May
Castle Rock, WA
- Average sunshine days in May: 15.3 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is April (10.5 days).
Average UV index in May
Castle Rock, WA
- Average UV index in May: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Castle Rock, WA
- Average cloud cover in May: 55
The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in May
Castle Rock, WA
- Average visibility in May: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Castle Rock, Washington, USA
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