This report describes the typical weather at the William R. Fairchild International Airport (Port Angeles, Washington, United States) weather station over the course of an average April. It is based on the historical records from 1981 to 2012. Earlier records are either unavailable or unreliable.
Port Angeles, Washington has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (58%) and oceans and seas (40%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 52°F to 57°F over the course of the month, exceeding 65°F or dropping below 47°F only one day in ten.
Over the course of April, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1:36 hours, implying an average day-over-day increase of 3.2 minutes.
The shortest day of the month is April 1 with 12:55 hours of daylight; the longest day is April 30 with 14:30 hours of daylight.
The earliest sunrise is at 5:57am on April 30; the latest sunset is at 8:27pm on April 30; the latest sunrise is at 6:51am on April 1; the earliest sunset is at 7:46pm on April 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 72% (partly cloudy) to 82% (mostly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 10% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 33% of the time, partly cloudy 4% of the time, and mostly cloudy or overcast 49% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 2, occurring in 55% of days. Precipitation is least likely around April 30, occurring in 47% of days.
Throughout April, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 76% of those days with precipitation. It is most likely around April 2, when it is observed during 41% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around April 4, when it is observed during 10% of all days.
The likelihood of snow falling is highest around April 1, occurring in 2% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 56% (mildly humid) to 92% (very humid) over the course of a typical April, rarely dropping below 40% (comfortable) and reaching as high as 99% (very humid).
The air is driest around April 21, at which time the relative humidity drops below 64% (mildly humid) three days out of four; it is most humid around April 1, rising above 89% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical April, the dew point typically varies from 32°F (dry) to 44°F (dry) and is rarely below 27°F (dry) or above 49°F (dry).
Over the course of April typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around April 30, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around April 1, at which time the average daily maximum wind speed is 10 mph (gentle breeze).