Average Weather in August at Angoon Seaplane Base Alaska, United States
Daily high temperatures decrease by 3°F, from 63°F to 60°F, rarely falling below 55°F or exceeding 70°F.
Daily low temperatures decrease by 3°F, from 52°F to 49°F, rarely falling below 44°F or exceeding 55°F.
For reference, on July 30, the hottest day of the year, temperatures at Angoon Seaplane Base typically range from 52°F to 63°F, while on January 15, the coldest day of the year, they range from 27°F to 36°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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.
Average Hourly Temperature in August
The month of August at Angoon Seaplane Base experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 65% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 63% on August 12.
The clearest day of the month is August 12, with clear, mostly clear, or partly cloudy conditions 37% of the time.
For reference, on January 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on August 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 37%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Angoon Seaplane Base, the chance of a wet day over the course of August is very rapidly increasing, starting the month at 45% and ending it at 58%.
For reference, the year's highest daily chance of a wet day is 72% on October 22, and its lowest chance is 36% on June 22.
Probability of Precipitation in August
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 August at Angoon Seaplane Base is very rapidly increasing, starting the month at 4.9 inches, when it rarely exceeds 7.6 inches or falls below 2.1 inches, and ending the month at 8.1 inches, when it rarely exceeds 12.1 inches or falls below 4.0 inches.
Average Monthly Rainfall in August
Over the course of August at Angoon Seaplane Base, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 18 minutes, implying an average daily decrease of 4 minutes, 36 seconds, and weekly decrease of 32 minutes, 12 seconds.
The shortest day of the month is August 31, with 14 hours, 0 minutes of daylight and the longest day is August 1, with 16 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month at Angoon Seaplane Base is 4:54 AM on August 1 and the latest sunrise is 1 hour, 3 minutes later at 5:57 AM on August 31.
The latest sunset is 9:13 PM on August 1 and the earliest sunset is 1 hour, 15 minutes earlier at 7:57 PM on August 31.
Daylight saving time is observed at Angoon Seaplane Base during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 3:59 AM and sets 18 hours, 2 minutes later, at 10:01 PM, while on December 21, the shortest day of the year, it rises at 8:39 AM and sets 6 hours, 35 minutes later, at 3:14 PM.
Sunrise & Sunset with Twilight in August
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 Angoon Seaplane Base is essentially constant during August, remaining around 0% throughout.
For reference, on June 27, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
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 Angoon Seaplane Base is gradually increasing during August, increasing from 4.6 miles per hour to 5.4 miles per hour over the course of the month.
For reference, on December 10, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on July 18, the calmest day of the year, the daily average wind speed is 4.5 miles per hour.
Average Wind Speed in August
Wind Direction in August
Angoon Seaplane Base 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 Angoon Seaplane Base is essentially constant during August, remaining around 55°F throughout.
The highest average surface water temperature during August is 55°F on August 13.
Average Water Temperature in August
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 Angoon Seaplane Base typically lasts for 6.2 months (190 days), from around April 20 to around October 27, rarely starting before April 4 or after May 6, and rarely ending before September 30 or after November 18.
The month of August at Angoon Seaplane Base is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
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 Angoon Seaplane Base are gradually increasing during August, increasing by 170°F, from 381°F to 551°F, over the course of the month.
Growing Degree Days in August
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 Angoon Seaplane Base is decreasing during August, falling by 1.2 kWh, from 4.3 kWh to 3.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Angoon Seaplane Base are 57.503 deg latitude, -134.585 deg longitude, and 0 ft elevation.
The topography within 2 miles of Angoon Seaplane Base contains significant variations in elevation, with a maximum elevation change of 676 feet and an average elevation above sea level of 62 feet. Within 10 miles contains significant variations in elevation (3,104 feet). Within 50 miles contains large variations in elevation (6,519 feet).
The area within 2 miles of Angoon Seaplane Base is covered by water (59%) and trees (40%), within 10 miles by water (53%) and trees (44%), and within 50 miles by trees (43%) and water (40%).
This report illustrates the typical weather at Angoon Seaplane Base year round, 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
Angoon Seaplane Base 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 are Juneau International Airport, Kake Airport, Sitka Rocky Gutierrez Airport, Hoonah Airport, Gustavus Airport, Petersburg James A. Johnson Airport, and Wrangell Airport.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
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.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.