April Weather at Orcas Island Airport Washington, United States
Daily high temperatures increase by 5°F, from 53°F to 58°F, rarely falling below 48°F or exceeding 64°F.
Daily low temperatures increase by 4°F, from 39°F to 44°F, rarely falling below 32°F or exceeding 50°F.
For reference, on July 30, the hottest day of the year, temperatures at Orcas Island Airport typically range from 55°F to 71°F, while on January 2, the coldest day of the year, they range from 36°F to 45°F.
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Gloucester, United Kingdom (4,667 miles away) is the far-away foreign place with temperatures most similar to Orcas Island Airport (view comparison).
The month of April at Orcas Island Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 64% to 54%.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 46% of the time.
For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Orcas Island Airport, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 39% and ending it at 26%.
For reference, the year's highest daily chance of a wet day is 56% on November 18, and its lowest chance is 8% on August 1.
Over the course of April at Orcas Island Airport, the chance of a day with only rain decreases from 37% to 26%, the chance of a day with mixed snow and rain decreases from 2% to 0%, and the chance of a day with only snow remains an essentially constant 0% throughout.
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during April at Orcas Island Airport is rapidly decreasing, starting the month at 2.9 inches, when it rarely exceeds 4.5 inches or falls below 1.4 inches, and ending the month at 1.9 inches, when it rarely exceeds 3.2 inches or falls below 0.6 inches.
Over the course of April at Orcas Island Airport, 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 hour, 39 minutes, implying an average daily increase of 3 minutes, 25 seconds, and weekly increase of 23 minutes, 54 seconds.
The shortest day of the month is April 1, with 12 hours, 53 minutes of daylight and the longest day is April 30, with 14 hours, 32 minutes of daylight.
The latest sunrise of the month at Orcas Island Airport is 6:49 AM on April 1 and the earliest sunrise is 56 minutes earlier at 5:53 AM on April 30.
The earliest sunset is 7:42 PM on April 1 and the latest sunset is 43 minutes later at 8:25 PM on April 30.
Daylight saving time is observed at Orcas Island Airport during 2023, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:08 AM and sets 16 hours, 10 minutes later, at 9:18 PM, while on December 22, the shortest day of the year, it rises at 8:02 AM and sets 8 hours, 16 minutes later, at 4:18 PM.
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
The figure below presents a compact representation of key lunar data for April 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy at Orcas Island Airport is essentially constant during April, remaining around 0% throughout.
For reference, on July 26, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed at Orcas Island Airport is gradually decreasing during April, decreasing from 5.9 miles per hour to 5.0 miles per hour over the course of the month.
For reference, on December 4, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.
The wind direction at Orcas Island Airport during April is predominantly out of the south from April 1 to April 4 and the west from April 4 to April 30.
Orcas Island Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature at Orcas Island Airport is gradually increasing during April, rising by 3°F, from 47°F to 50°F, over the course of the month.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season at Orcas Island Airport typically lasts for 7.9 months (242 days), from around March 23 to around November 20, rarely starting before February 13 or after May 2, and rarely ending before October 29 or after December 18.
The month of April at Orcas Island Airport is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 60% to 88% over the course of the month.
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days at Orcas Island Airport are gradually increasing during April, increasing by 43°F, from 20°F to 63°F, over the course of the month.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy at Orcas Island Airport is rapidly increasing during April, rising by 1.5 kWh, from 3.7 kWh to 5.2 kWh, over the course of the month.
For the purposes of this report, the geographical coordinates of Orcas Island Airport are 48.708 deg latitude, -122.911 deg longitude, and 20 ft elevation.
The topography within 2 miles of Orcas Island Airport contains very significant variations in elevation, with a maximum elevation change of 886 feet and an average elevation above sea level of 64 feet. Within 10 miles contains very significant variations in elevation (2,359 feet). Within 50 miles contains large variations in elevation (10,604 feet).
The area within 2 miles of Orcas Island Airport is covered by water (49%), trees (29%), and herbaceous vegetation (16%), within 10 miles by water (77%) and trees (20%), and within 50 miles by water (40%) and trees (33%).
This report illustrates the typical weather at Orcas Island Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
Orcas Island Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Saturna Island Meteorological Aeronautical Presentation System, Saturna / Capmon, Friday Harbor Airport, White Rock Automatic Weather Reporting System, Bellingham International Airport, Discovery Island, Naval Air Station Whidbey Island, and Victoria University.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © OpenStreetMap contributors.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
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