It is the lowest average temperature of the whole year. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. The stations contributing to this reconstruction are: Ketchikan International Airport (99%, 0.9 kilometers, north); Metlakatla Seaplane Base (1.2%, 24 kilometers, south); and Hydaburg Seaplane Base (0.2%, 76 kilometers, west). The day of the year with the warmest water is August 7, with an average temperature of 56°F. 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). Prince Rupert B.C. Annual Weather Averages in Ketchikan. The average hourly wind speed in Ketchikan experiences significant seasonal variation over the course of the year. Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC. The earliest sunset is at 3:15 PM on December 13, and the latest sunset is 6 hours, 17 minutes later at 9:32 PM on June 23. The earliest sunrise is at 4:04 AM on June 17, and the latest sunrise is 4 hours, 10 minutes later at 8:13 AM on December 28. Forecast as PDF. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The calmest day of the year is July 18, with an average hourly wind speed of 5.0 miles per hour. This report illustrates the typical weather in Ketchikan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. For each station, the records are corrected for the elevation difference between that station and Ketchikan according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The number of hours during which the Sun is visible (black line). The amount of rain in July is high with an average of 109mm (4.3in). 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. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. The shaded overlays indicate night and civil twilight. Rain falls throughout the year in Ketchikan. 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. precip. 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. On average, the coolest month is January. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. The cold season lasts for 4.3 months, from November 9 to March 19, with an average daily high temperature below 44°F. The coldest day of the year is December 31, with an average low of 31°F and high of 38°F. The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. The solar day over the course of the year 2020. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. : Average precipitation in inch - Days precip. 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.
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