Spring Weather at Klawock Airport United StatesDaily high temperatures increase by 16°F, from 43°F to 59°F, rarely falling below 36°F or exceeding 67°F. Daily low temperatures increase by 13°F, from 32°F to 45°F, rarely falling below 23°F or exceeding 49°F. For reference, on July 31, the hottest day of the year, temperatures at Klawock Airport typically range from 52°F to 64°F, while on December 28, the coldest day of the year, they range from 32°F to 39°F. The figure below shows you a compact characterization of the hourly average spring temperatures. 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. High Peak, United Kingdom (4,421 miles away) is the far-away foreign place with temperatures most similar to Klawock Airport (view comparison). CloudsThe spring at Klawock Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 73% to 64%. The clearest day of the spring is May 27, with clear, mostly clear, or partly cloudy conditions 36% of the time. For reference, on January 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 41%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Klawock Airport, the chance of a wet day over the course of the spring is very rapidly decreasing, starting the season at 55% and ending it at 39%. For reference, the year's highest daily chance of a wet day is 73% on October 31, and its lowest chance is 38% on May 27. Over the course of the spring at Klawock Airport, the chance of a day with only rain decreases from 48% to 39%, the chance of a day with mixed snow and rain decreases from 5% to 0%, and the chance of a day with only snow remains an essentially constant 0% throughout. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the spring at Klawock Airport is very rapidly decreasing, starting the season at 6.3 inches, when it rarely exceeds 9.6 inches or falls below 3.0 inches, and ending the season at 3.6 inches, when it rarely exceeds 5.8 inches or falls below 1.5 inches. SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day snowfall during the spring at Klawock Airport is decreasing, starting the season at 1.9 inches, when it rarely exceeds 5.7 inches or falls below -0.0 inches, and ending the season at 0.0 inches, when it rarely exceeds 0.0 inches or falls below -0.0 inches. SunOver the course of the spring at Klawock Airport, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 6 hours, 19 minutes, implying an average daily increase of 4 minutes, 10 seconds, and weekly increase of 29 minutes, 8 seconds. The shortest day of the spring is March 1, with 10 hours, 48 minutes of daylight and the longest day is May 31, with 17 hours, 6 minutes of daylight. The latest sunrise of the spring at Klawock Airport is 7:18 AM on March 10 and the earliest sunrise is 3 hours, 1 minute earlier at 4:17 AM on May 31. The earliest sunset is 5:28 PM on March 1 and the latest sunset is 3 hours, 55 minutes later at 9:23 PM on May 31. Daylight saving time (DST) ends at 3:00 AM on March 10, 2024, shifting sunrise and sunset to be an hour earlier. For reference, on June 20, the longest day of the year, the Sun rises at 4:08 AM and sets 17 hours, 31 minutes later, at 9:39 PM, while on December 21, the shortest day of the year, it rises at 8:19 AM and sets 7 hours, 3 minutes later, at 3:22 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. MoonThe figure below presents a compact representation of key lunar data for the spring of 2024. 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. HumidityWe 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 Klawock Airport is essentially constant during the spring, remaining around 0% throughout. For reference, on July 27, 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. WindThis 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 Klawock Airport is rapidly decreasing during the spring, decreasing from 8.0 miles per hour to 6.0 miles per hour over the course of the season. For reference, on January 16, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 5.2 miles per hour. The wind direction at Klawock Airport during the spring is predominantly out of the east from March 1 to April 19, the south from April 19 to May 23, and the west from May 23 to May 31. Water TemperatureKlawock 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 Klawock Airport is increasing during the spring, rising by 6°F, from 42°F to 48°F, over the course of the season. The lowest average surface water temperature during the spring is 42°F on March 11. Growing SeasonDefinitions 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 Klawock Airport typically lasts for 6.0 months (185 days), from around April 24 to around October 25, rarely starting before April 6 or after May 12, and rarely ending before October 2 or after November 16. During the spring at Klawock Airport, the chance that a given day is within the growing season is very rapidly increasing rising from 0% to 100% over the course of the season. 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 Klawock Airport are gradually increasing during the spring, increasing by 71°F, from 1°F to 73°F, over the course of the season. Solar EnergyThis 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 Klawock Airport is very rapidly increasing during the spring, rising by 3.6 kWh, from 1.6 kWh to 5.1 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of Klawock Airport are 55.579 deg latitude, -133.077 deg longitude, and 30 ft elevation. The topography within 2 miles of Klawock Airport contains very significant variations in elevation, with a maximum elevation change of 1,552 feet and an average elevation above sea level of 147 feet. Within 10 miles contains very significant variations in elevation (3,865 feet). Within 50 miles also contains extreme variations in elevation (3,888 feet). The area within 2 miles of Klawock Airport is covered by water (46%) and trees (43%), within 10 miles by trees (60%) and water (24%), and within 50 miles by water (54%) and trees (41%). Data SourcesThis report illustrates the typical weather at Klawock 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 PointKlawock 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 Hydaburg Seaplane Base, Wrangell Airport, Petersburg James A. Johnson Airport, Langara Meteorological Station, Ketchikan International Airport, Metlakatla Seaplane Base, Annette Island Airport, and Kake Airport. Other DataAll 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. DisclaimerThe 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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