Average Weather at Seldovia Airport Alaska, United States
At Seldovia Airport, the summers are cool and mostly cloudy and the winters are long, freezing, wet, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 21°F to 61°F and is rarely below 4°F or above 67°F.
The warm season lasts for 3.1 months, from June 8 to September 12, with an average daily high temperature above 54°F. The hottest day of the year is July 28, with an average high of 61°F and low of 49°F.
The cold season lasts for 4.5 months, from November 8 to March 23, with an average daily high temperature below 37°F. The coldest day of the year is January 17, with an average low of 21°F and high of 30°F.
Average High and Low Temperature
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
At Seldovia 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 Seldovia Airport begins around July 14 and lasts for 4.4 months, ending around November 25. On November 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 45% of the time, and overcast or mostly cloudy 55% of the time.
The cloudier part of the year begins around November 25 and lasts for 7.6 months, ending around July 14. On December 18, the cloudiest day of the year, the sky is overcast or mostly cloudy 67% of the time, and clear, mostly clear, or partly cloudy 33% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Seldovia Airport varies throughout the year.
The wetter season lasts 6.7 months, from August 5 to February 25, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 45% on September 23.
The drier season lasts 5.4 months, from February 25 to August 5. The smallest chance of a wet day is 24% on June 25.
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 throughout the year is rain alone, with a peak probability of 45% on September 23.
Daily Chance of Precipitation
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 of the year. Seldovia Airport experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year at Seldovia Airport. The most rain falls during the 31 days centered around September 22, with an average total accumulation of 5.2 inches.
The least rain falls around March 21, with and average total accumulation of 1.9 inches.
Average Monthly Rainfall
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 of the year. Seldovia Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 6.6 months, from October 11 to April 28, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 22, with an average total liquid-equivalent accumulation of 1.0 inches.
The snowless period of the year lasts for 5.5 months, from April 28 to October 11. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Seldovia Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 6 hours, 3 minutes of daylight; the longest day is June 21, with 18 hours, 40 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:48 AM on June 18, and the latest sunrise is 5 hours, 17 minutes later at 10:05 AM on December 28. The earliest sunset is at 4:04 PM on December 15, and the latest sunset is 7 hours, 24 minutes later at 11:28 PM on June 22.
Daylight saving time (DST) is observed at Seldovia 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
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 Seldovia 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
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 Seldovia Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.0 months, from September 16 to April 17, with average wind speeds of more than 6.6 miles per hour. The windiest day of the year is January 8, with an average hourly wind speed of 9.1 miles per hour.
The calmer time of year lasts for 5.0 months, from April 17 to September 16. The calmest day of the year is June 27, with an average hourly wind speed of 4.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Seldovia Airport varies throughout the year.
The wind is most often from the north for 3.1 weeks, from February 23 to March 17 and for 2.1 months, from October 2 to December 4, with a peak percentage of 41% on November 5. The wind is most often from the east for 3.1 months, from March 17 to June 21; for 1.0 months, from September 2 to October 2; and for 2.7 months, from December 4 to February 23, with a peak percentage of 42% on May 3. The wind is most often from the south for 1.9 months, from June 21 to August 17, with a peak percentage of 37% on July 18.
Seldovia 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 2.8 months, from July 8 to October 1, with an average temperature above 50°F. The day of the year with the warmest water is August 18, with an average temperature of 53°F.
The time of year with cooler water lasts for 4.8 months, from December 20 to May 13, with an average temperature below 42°F. The day of the year with the coolest water is March 14, with an average temperature of 39°F.
Average Water Temperature
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 extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.1 months, from May 3 to August 5, with an average daily incident shortwave energy per square meter above 4.5 kWh. The brightest day of the year is June 18, with an average of 5.6 kWh.
The darker period of the year lasts for 4.1 months, from October 19 to February 22, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest day of the year is December 20, with an average of 0.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Seldovia Airport are 59.442 deg latitude, -151.704 deg longitude, and 256 ft elevation.
The topography within 2 miles of Seldovia Airport contains very significant variations in elevation, with a maximum elevation change of 1,906 feet and an average elevation above sea level of 357 feet. Within 10 miles contains very significant variations in elevation (3,799 feet). Within 50 miles also contains extreme variations in elevation (6,283 feet).
The area within 2 miles of Seldovia Airport is covered by trees (49%), water (37%), and shrubs (14%), within 10 miles by water (50%) and shrubs (25%), and within 50 miles by water (71%) and shrubs (12%).
This report illustrates the typical weather at Seldovia 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
Seldovia 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.
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.