Average Weather at Holy Cross Airport Alaska, United States
At Holy Cross Airport, the summers are cool; the winters are long, frigid, snowy, and windy; and it is mostly cloudy year round. Over the course of the year, the temperature typically varies from -4°F to 66°F and is rarely below -35°F or above 76°F.
Based on the tourism score, the best time of year to visit Holy Cross Airport for warm-weather activities is from late June to late July.
The warm season lasts for 3.7 months, from May 19 to September 10, with an average daily high temperature above 55°F. The hottest day of the year is July 1, with an average high of 66°F and low of 49°F.
The cold season lasts for 3.8 months, from November 14 to March 8, with an average daily high temperature below 21°F. The coldest day of the year is January 18, with an average low of -4°F and high of 10°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 Holy Cross 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 Holy Cross Airport begins around January 12 and lasts for 6.2 months, ending around July 18. On May 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 41% of the time, and overcast or mostly cloudy 59% of the time.
The cloudier part of the year begins around July 18 and lasts for 5.8 months, ending around January 12. On December 12, 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 Holy Cross Airport varies throughout the year.
The wetter season lasts 3.0 months, from July 8 to October 10, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 37% on August 10.
The drier season lasts 9.0 months, from October 10 to July 8. The smallest chance of a wet day is 12% on March 17.
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 Holy Cross Airport changes throughout the year.
Rain alone is the most common for 6.9 months, from April 2 to October 28. The highest chance of a day with rain alone is 37% on August 10.
Snow alone is the most common for 5.1 months, from October 28 to April 2. The highest chance of a day with snow alone is 15% on December 12.
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. Holy Cross Airport experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.5 months, from April 10 to November 26, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 14, with an average total accumulation of 2.9 inches.
The rainless period of the year lasts for 4.5 months, from November 26 to April 10. The least rain falls around March 12, with an average total accumulation of 0.3 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. Holy Cross Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 7.3 months, from September 26 to May 2, 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 23, with an average total liquid-equivalent accumulation of 1.0 inches.
The snowless period of the year lasts for 4.8 months, from May 2 to September 26. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Holy Cross Airport varies extremely over the course of the year. In 2018, the shortest day is December 21, with 5 hours, 4 minutes of daylight; the longest day is June 21, with 19 hours, 51 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:45 AM on June 19, and the latest sunrise is 6 hours, 21 minutes later at 11:06 AM on December 25. The earliest sunset is at 4:08 PM on December 17, and the latest sunset is 8 hours, 28 minutes later at 12:36 AM on June 22.
Daylight saving time (DST) is observed at Holy Cross 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 Holy Cross 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 Holy Cross Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.4 months, from October 26 to April 9, with average wind speeds of more than 9.6 miles per hour. The windiest day of the year is February 11, with an average hourly wind speed of 11.8 miles per hour.
The calmer time of year lasts for 6.5 months, from April 9 to October 26. The calmest day of the year is June 28, with an average hourly wind speed of 7.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Holy Cross Airport varies throughout the year.
The wind is most often from the north for 2.1 weeks, from January 8 to January 23; for 2.7 months, from February 24 to May 16; and for 2.3 months, from September 27 to December 6, with a peak percentage of 42% on January 16. The wind is most often from the east for 1.0 months, from January 23 to February 24; for 3.0 weeks, from September 6 to September 27; and for 1.1 months, from December 6 to January 8, with a peak percentage of 41% on January 29. The wind is most often from the south for 3.7 months, from May 16 to September 6, with a peak percentage of 42% on July 28.
Best Time of Year to Visit
To characterize how pleasant the weather is at Holy Cross 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 Holy Cross Airport for general outdoor tourist activities is from late June to late July, with a peak score in the second week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Holy Cross Airport for hot-weather activities is from late June to early July.
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 Holy Cross Airport typically lasts for 3.8 months (117 days), from around May 18 to around September 12, rarely starting before May 1 or after June 4, and rarely ending before August 22 or after October 3.
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 Holy Cross Airport should appear around June 5, only rarely appearing before May 26 or after June 18.
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 3.0 months, from April 28 to July 27, with an average daily incident shortwave energy per square meter above 4.4 kWh. The brightest day of the year is June 12, with an average of 5.5 kWh.
The darker period of the year lasts for 4.2 months, from October 16 to February 21, with an average daily incident shortwave energy per square meter below 1.2 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 Holy Cross Airport are 62.190 deg latitude, -159.774 deg longitude, and 56 ft elevation.
The topography within 2 miles of Holy Cross Airport contains significant variations in elevation, with a maximum elevation change of 499 feet and an average elevation above sea level of 97 feet. Within 10 miles also contains significant variations in elevation (778 feet). Within 50 miles contains significant variations in elevation (3,337 feet).
The area within 2 miles of Holy Cross Airport is covered by shrubs (34%), herbaceous vegetation (18%), sparse vegetation (17%), and trees (16%), within 10 miles by herbaceous vegetation (38%) and shrubs (28%), and within 50 miles by shrubs (45%) and trees (30%).
This report illustrates the typical weather at Holy Cross 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
Holy Cross 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 Anvik Airport, Aniak Airport, Kalskag Airport, Russian Mission Airport, Unalakleet Airport, Marshall Don Hunter Sr. Airport, Sleetmute Airport, and St. Michael 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.