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Average Weather at Skagway Airport Alaska, United States

At Skagway Airport, the temperature typically varies from 18°F to 61°F over the course of the year, and is rarely below -3°F or above 71°F.

The warm season lasts for 3.7 months, from May 18 to September 10, with an average daily high temperature above 54°F. The hottest day of the year is July 9, with an average high of 61°F and low of 48°F.

The cold season lasts for 3.9 months, from November 12 to March 9, with an average daily high temperature below 34°F. The coldest day of the year is January 15, with an average low of 18°F and high of 27°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfreezingfreezingchillychillycoldcoldcoolcool
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Sun

The length of the day at Skagway Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 6 hours, 2 minutes of daylight; the longest day is June 21, with 18 hours, 40 minutes of daylight.

Hours of Daylight and Twilight

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 is at 3:42 AM on June 18, and the latest sunrise is 5 hours, 17 minutes later at 8:59 AM on December 27. The earliest sunset is at 2:59 PM on December 14, and the latest sunset is 7 hours, 24 minutes later at 10:23 PM on June 23.

Daylight saving time (DST) is observed at Skagway Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Clouds

At Skagway Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Skagway Airport begins around February 16 and lasts for 4.8 months, ending around July 11. On May 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 34% of the time, and overcast or mostly cloudy 66% of the time.

The cloudier part of the year begins around July 11 and lasts for 7.2 months, ending around February 16. On October 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 79% of the time, and clear, mostly clear, or partly cloudy 21% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecOct 479%Oct 479%May 1566%May 1566%Feb 1673%Feb 1673%Jul 1173%Jul 1173%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
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. The chance of wet days at Skagway Airport varies significantly throughout the year.

The wetter season lasts 5.3 months, from August 22 to February 3, with a greater than 46% chance of a given day being a wet day. The chance of a wet day peaks at 64% on October 10.

The drier season lasts 6.6 months, from February 3 to August 22. The smallest chance of a wet day is 29% on June 22.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation at Skagway Airport changes throughout the year.

Rain alone is the most common for 8.3 months, from March 11 to November 19. The highest chance of a day with rain alone is 61% on October 9.

Mixed snow and rain is the most common for 2.2 months, from February 11 to March 11 and from November 19 to December 27. The highest chance of a day with mixed snow and rain is 23% on December 10.

Snow alone is the most common for 1.5 months, from December 27 to February 11. The highest chance of a day with snow alone is 23% on January 16.

Daily Chance of Precipitation

snowsnowmixedmixedrainrainmixedmixed0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecOct 1064%Oct 1064%Jun 2229%Jun 2229%Feb 1143%Feb 1143%Nov 1952%Nov 1952%Jan 148%Jan 148%Aug 2247%Aug 2247%snowsnowmixedmixedrainrain
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Skagway Airport experiences very significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Skagway Airport. The most rain falls during the 31 days centered around October 2, with an average total accumulation of 7.1 inches.

The least rain falls around February 9, with and average total accumulation of 1.8 inches.

Average Monthly Rainfall

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.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Skagway Airport experiences very significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 6.8 months, from October 6 to April 30, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 16, with an average total liquid-equivalent accumulation of 2.6 inches.

The snowless period of the year lasts for 5.2 months, from April 30 to October 6. The least snow falls around July 26, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent snowfall (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 rainfall.

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 perceived humidity level at Skagway Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

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 experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from September 23 to April 11, with average wind speeds of more than 3.1 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 3.9 miles per hour.

The calmer time of year lasts for 5.4 months, from April 11 to September 23. The calmest day of the year is May 23, with an average hourly wind speed of 2.2 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Skagway Airport is from the south throughout the year.

Wind Direction

0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.5 months, from June 30 to September 16, with an average temperature above 52°F. The day of the year with the warmest water is August 10, with an average temperature of 55°F.

The time of year with cooler water lasts for 4.8 months, from December 10 to May 3, with an average temperature below 43°F. The day of the year with the coolest water is March 16, with an average temperature of 40°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, 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 experiences very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.0 months, from April 24 to July 24, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 12, with an average of 5.8 kWh.

The darker period of the year lasts for 4.3 months, from October 12 to February 20, with an average daily incident shortwave energy per square meter below 1.4 kWh. The darkest day of the year is December 22, with an average of 0.2 kWh.

Average Daily Incident Shortwave Solar Energy

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, 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 .