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Average Weather in August at Skagway Airport Alaska, United States

At Skagway Airport, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 4°F, from 61°F to 57°F over the course of the month, and rarely exceeding 69°F or dropping below 51°F.

Daily low temperatures decrease by 3°F, from 49°F to 45°F, rarely falling below 40°F or exceeding 53°F.

For reference, on July 9, the hottest day of the year, temperatures at Skagway Airport typically range from 48°F to 61°F, while on January 15, the coldest day of the year, they range from 18°F to 27°F.

Average High and Low Temperature in August

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in August at Skagway Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJulSepvery coldcoldcool
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

The month of August at Skagway Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 72% to 76%.

The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on October 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on May 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 34%.

Cloud Cover Categories in August

Cloud Cover Categories in August at Skagway Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepAug 128%Aug 128%Aug 3124%Aug 3124%Aug 1128%Aug 1128%Aug 2126%Aug 2126%mostly clearmostly cloudyclearovercastpartly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Skagway Airport, the chance of a wet day over the course of August is very rapidly increasing, starting the month at 37% and ending it at 51%.

For reference, the year's highest daily chance of a wet day is 64% on October 10, and its lowest chance is 29% on June 22.

Probability of Precipitation in August

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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 Skagway Airport is very rapidly increasing, starting the month at 3.2 inches, when it rarely exceeds 5.1 inches or falls below 1.2 inches, and ending the month at 5.2 inches, when it rarely exceeds 7.9 inches or falls below 2.4 inches.

Average Monthly Rainfall in August

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

Over the course of August at Skagway Airport, 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, 32 minutes, implying an average daily decrease of 5 minutes, 4 seconds, and weekly decrease of 35 minutes, 25 seconds.

The shortest day of the month is August 31, with 14 hours, 8 minutes of daylight and the longest day is August 1, with 16 hours, 40 minutes of daylight.

Hours of Daylight and Twilight in August

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month at Skagway Airport is 4:46 AM on August 1 and the latest sunrise is 1 hour, 10 minutes later at 5:56 AM on August 31.

The latest sunset is 9:26 PM on August 1 and the earliest sunset is 1 hour, 22 minutes earlier at 8:04 PM on August 31.

Daylight saving time is observed at Skagway Airport during 2017, 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 3:43 AM and sets 18 hours, 40 minutes later, at 10:23 PM, while on December 21, the shortest day of the year, it rises at 8:58 AM and sets 6 hours, 2 minutes later, at 3:00 PM.

Sunrise & Sunset with Twilight in August

The solar day over the course of August. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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 Skagway Airport is essentially constant during August, remaining around 0% throughout.

For reference, on June 17, 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.

Humidity Comfort Levels in August

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Skagway Airport is essentially constant during August, remaining within 0.2 miles per hour of 5.1 miles per hour throughout.

For reference, on February 25, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on May 23, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.

Average Wind Speed in August

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction at Skagway Airport throughout August is predominantly from the south, with a peak proportion of 62% on August 5.

Wind Direction in August

Wind Direction in August at Skagway Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepsoutheastnorthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Skagway 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 Skagway Airport is essentially constant during August, remaining within 1°F of 55°F throughout.

The highest average surface water temperature during August is 55°F on August 12.

Average Water Temperature in August

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

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 Skagway Airport typically lasts for 4.6 months (142 days), from around May 9 to around September 28, rarely starting before April 21 or after May 29, and rarely ending before September 7 or after October 16.

The month of August at Skagway Airport is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 96% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in August

Time Spent in Various Temperature Bands and the Growing Season in August at Skagway Airportgrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 1100%Aug 196%Aug 3196%Aug 31100%Aug 11100%Aug 11100%Aug 21100%Aug 2150%Sep 2850%Sep 2890%Sep 790%Sep 7coldcoolvery coldcomfortablefreezing
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing 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 Skagway Airport is gradually increasing during August, increasing by 107°F, from 285°F to 392°F, over the course of the month.

Growing Degree Days in August

The average growing degree days accumulated over the course of August, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Skagway Airport is decreasing during August, falling by 1.4 kWh, from 4.5 kWh to 3.1 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Skagway Airport are 59.460 deg latitude, -135.316 deg longitude, and 1,083 ft elevation.

The topography within 2 miles of Skagway Airport contains extreme variations in elevation, with a maximum elevation change of 3,973 feet and an average elevation above sea level of 780 feet. Within 10 miles also contains extreme variations in elevation (7,162 feet). Within 50 miles also contains extreme variations in elevation (8,412 feet).

The area within 2 miles of Skagway Airport is covered by trees (55%) and water (29%), within 10 miles by snow and glaciers (28%) and trees (21%), and within 50 miles by snow and glaciers (27%) and trees (20%).

Data Sources

This report illustrates the typical weather at Skagway Airport 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

Skagway 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 are Haines Airport, Gustavus Airport, Erik Nielsen Whitehorse International Airport, Juneau International Airport, Hoonah Airport, and Haines Junction.

Other Data

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.

Disclaimer

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.