Average Weather at Valdez Airport Alaska, United States
At Valdez Airport, the summers are cool, wet, and overcast and the winters are long, freezing, snowy, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 16°F to 62°F and is rarely below -2°F or above 70°F.
Based on the tourism score, the best time of year to visit Valdez Airport for warm-weather activities is from late June to early August.
The warm season lasts for 3.6 months, from May 22 to September 10, with an average daily high temperature above 55°F. The hottest day of the year is July 7, with an average high of 62°F and low of 47°F.
The cold season lasts for 4.1 months, from November 8 to March 12, with an average daily high temperature below 34°F. The coldest day of the year is January 20, with an average low of 16°F and high of 27°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
Disentis, Switzerland (4,863 miles away); Nesbyen, Norway (3,931 miles); and Mosjøen, Norway (3,605 miles) are the far-away foreign places with temperatures most similar to Valdez Airport (view comparison).
At Valdez 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 Valdez Airport begins around February 15 and lasts for 4.1 months, ending around June 20. On March 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 40% of the time, and overcast or mostly cloudy 60% of the time.
The cloudier part of the year begins around June 20 and lasts for 7.9 months, ending around February 15. On September 28, the cloudiest day of the year, the sky is overcast or mostly cloudy 72% of the time, and clear, mostly clear, or partly cloudy 28% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Valdez Airport varies throughout the year.
The wetter season lasts 6.1 months, from August 2 to February 4, with a greater than 49% chance of a given day being a wet day. The chance of a wet day peaks at 62% on September 27.
The drier season lasts 5.9 months, from February 4 to August 2. The smallest chance of a wet day is 35% on May 9.
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 Valdez Airport changes throughout the year.
Rain alone is the most common for 7.7 months, from March 24 to November 12. The highest chance of a day with rain alone is 61% on September 23.
Snow alone is the most common for 3.2 months, from November 12 to February 16. The highest chance of a day with snow alone is 26% on December 14.
Mixed snow and rain is the most common for 1.2 months, from February 16 to March 24. The highest chance of a day with mixed snow and rain is 22% on December 15.
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. Valdez Airport experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year at Valdez Airport. The most rain falls during the 31 days centered around September 22, with an average total accumulation of 9.9 inches.
The least rain falls around March 5, with an average total accumulation of 2.2 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. Valdez Airport experiences extreme seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 7.2 months, from October 1 to May 8, 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 20, with an average total liquid-equivalent accumulation of 4.1 inches.
The snowless period of the year lasts for 4.8 months, from May 8 to October 1. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Valdez Airport varies extremely over the course of the year. In 2018, the shortest day is December 21, with 5 hours, 29 minutes of daylight; the longest day is June 21, with 19 hours, 20 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:06 AM on June 19, and the latest sunrise is 5 hours, 54 minutes later at 10:00 AM on December 26. The earliest sunset is at 3:26 PM on December 16, and the latest sunset is 8 hours, 1 minute later at 11:27 PM on June 22.
Daylight saving time (DST) is observed at Valdez Airport during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
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 Valdez 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 Valdez Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.0 months, from October 4 to April 4, with average wind speeds of more than 7.7 miles per hour. The windiest day of the year is January 6, with an average hourly wind speed of 11.2 miles per hour.
The calmer time of year lasts for 6.0 months, from April 4 to October 4. The calmest day of the year is July 4, with an average hourly wind speed of 4.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Valdez Airport varies throughout the year.
The wind is most often from the south for 4.0 months, from May 17 to September 16, with a peak percentage of 44% on July 29. The wind is most often from the north for 8.0 months, from September 16 to May 17, with a peak percentage of 54% on January 1.
Valdez 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 June 23 to September 17, with an average temperature above 52°F. The day of the year with the warmest water is August 4, with an average temperature of 56°F.
The time of year with cooler water lasts for 4.9 months, from December 8 to May 6, with an average temperature below 41°F. The day of the year with the coolest water is February 27, with an average temperature of 37°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is at Valdez Airport throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Valdez Airport for general outdoor tourist activities is from late June to early August, with a peak score in the first week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Valdez Airport typically lasts for 5.1 months (156 days), from around May 1 to around October 4, rarely starting before April 14 or after May 19, and rarely ending before September 15 or after October 23.
Time Spent in Various Temperature Bands and 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.
Based on growing degree days alone, the first spring blooms at Valdez Airport should appear around June 15, only rarely appearing before June 3 or after July 3.
Growing Degree Days
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 2.9 months, from April 27 to July 22, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 3, with an average of 5.8 kWh.
The darker period of the year lasts for 4.3 months, from October 14 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 21, with an average of 0.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Valdez Airport are 61.134 deg latitude, -146.248 deg longitude, and 141 ft elevation.
The topography within 2 miles of Valdez Airport contains extreme variations in elevation, with a maximum elevation change of 5,200 feet and an average elevation above sea level of 809 feet. Within 10 miles also contains extreme variations in elevation (7,126 feet). Within 50 miles also contains extreme variations in elevation (12,277 feet).
The area within 2 miles of Valdez Airport is covered by shrubs (41%), herbaceous vegetation (22%), sparse vegetation (16%), and water (16%), within 10 miles by snow and glaciers (26%) and shrubs (26%), and within 50 miles by snow and glaciers (27%) and water (19%).
This report illustrates the typical weather at Valdez 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
Valdez 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 Valdez Weather Station Office; Merle K. (Mudhole) Smith Airport; Skelton Airport; Gulkana Airport; Whittier Airport; Portage, Portage Glacier; Palmer Municipal Airport; and Birchwood 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.