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Average Weather in Dillingham Alaska, United States

In Dillingham, the summers are cool and mostly cloudy and the winters are long, freezing, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 11°F to 63°F and is rarely below -15°F or above 71°F.

Climate Summary

freezingvery coldcoldcoolcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDec46%46%35%35%overcastclearprecipitation: 3.8 inprecipitation: 3.8 in1.4 in1.4 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 2.3tourism score: 2.30.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Dillingham for warm-weather activities is from mid July to mid August.

Temperature

The warm season lasts for 3.7 months, from May 25 to September 14, with an average daily high temperature above 55°F. The hottest day of the year is July 23, with an average high of 63°F and low of 49°F.

The cold season lasts for 4.1 months, from November 13 to March 18, with an average daily high temperature below 30°F. The coldest day of the year is January 18, with an average low of 11°F and high of 22°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, 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

Average Hourly Temperature in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingvery coldcoldcoolvery cold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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.

Strömsund, Sweden (3,944 miles away) and Lakselv, Norway (3,520 miles) are the far-away foreign places with temperatures most similar to Dillingham (view comparison).

Clouds

In Dillingham, 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 in Dillingham begins around September 16 and lasts for 1.9 months, ending around November 12. On October 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 46% of the time, and overcast or mostly cloudy 54% of the time.

The cloudier part of the year begins around November 12 and lasts for 10 months, ending around September 16. On January 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 65% of the time, and clear, mostly clear, or partly cloudy 35% of the time.

Cloud Cover Categories

Cloud Cover Categories in DillinghamclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 1546%Oct 1546%Jan 735%Jan 735%clearmostly clearpartly cloudymostly cloudyovercast
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 in Dillingham varies throughout the year.

The wetter season lasts 6.9 months, from July 1 to January 31, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 40% on September 8.

The drier season lasts 5.1 months, from January 31 to July 1. The smallest chance of a wet day is 20% on April 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 in Dillingham changes throughout the year.

Rain alone is the most common for 11 months, from February 2 to December 7 and from December 15 to December 29. The highest chance of a day with rain alone is 40% on September 8.

Snow alone is the most common for 1.4 months, from December 7 to December 15 and from December 29 to February 2. The highest chance of a day with snow alone is 13% on January 19.

Daily Chance of Precipitation

Daily Chance of Precipitation in DillinghamsnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Sep 840%Sep 840%Apr 2220%Apr 2220%Feb 228%Feb 228%Dec 730%Dec 730%Jul 130%Jul 130%snowrainmixed
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 of the year. Dillingham experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Dillingham. The most rain falls during the 31 days centered around September 16, with an average total accumulation of 3.8 inches.

The least rain falls around March 14, with an average total accumulation of 0.8 inches.

Average Monthly Rainfall

Average Monthly Rainfall in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 in6 in7 inSep 163.8 inSep 163.8 inMar 140.8 inMar 140.8 in
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 of the year. Dillingham experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.0 months, from October 2 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 January 13, with an average total liquid-equivalent accumulation of 1.1 inches.

The snowless period of the year lasts for 5.0 months, from May 2 to October 2. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in DillinghamsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 in4.0 inJan 131.1 inJan 131.1 inJul 240.0 inJul 240.0 inOct 20.1 inOct 20.1 inMay 20.1 inMay 20.1 in
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.

Sun

The length of the day in Dillingham varies extremely over the course of the year. In 2017, the shortest day is December 21, with 6 hours, 10 minutes of daylight; the longest day is June 20, with 18 hours, 31 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 5:19 AM on June 18, and the latest sunrise is 5 hours, 9 minutes later at 10:28 AM on December 27. The earliest sunset is at 4:35 PM on December 15, and the latest sunset is 7 hours, 16 minutes later at 11:51 PM on June 22.

Daylight saving time (DST) is observed in Dillingham 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

Sunrise & Sunset with Twilight and Daylight Saving Time in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 185:19 AMJun 185:19 AM11:51 PMJun 2211:51 PMJun 22Dec 154:35 PMDec 154:35 PM10:28 AMDec 2710:28 AMDec 27Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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.

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 in Dillingham, 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

Humidity Comfort Levels in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 110%Feb 110%Aug 130%Aug 130%drydry
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 in Dillingham experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from September 26 to April 15, with average wind speeds of more than 11.5 miles per hour. The windiest day of the year is January 27, with an average hourly wind speed of 14.6 miles per hour.

The calmer time of year lasts for 5.4 months, from April 15 to September 26. The calmest day of the year is June 28, with an average hourly wind speed of 8.4 miles per hour.

Average Wind Speed

Average Wind Speed in DillinghamwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mphJan 2714.6 mphJan 2714.6 mphJun 288.4 mphJun 288.4 mphSep 2611.5 mphSep 2611.5 mphApr 1511.5 mphApr 1511.5 mph
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 in Dillingham varies throughout the year.

The wind is most often from the east for 1.5 months, from May 1 to June 15, with a peak percentage of 34% on May 25. The wind is most often from the south for 1.7 months, from June 15 to August 6, with a peak percentage of 36% on July 28. The wind is most often from the north for 7.6 months, from September 12 to May 1, with a peak percentage of 44% on January 1.

Wind Direction

Wind Direction in DillinghamNESWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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

Dillingham 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.4 months, from July 10 to September 24, with an average temperature above 51°F. The day of the year with the warmest water is August 19, with an average temperature of 56°F.

The time of year with cooler water lasts for 5.5 months, from November 20 to May 3, with an average temperature below 36°F. The day of the year with the coolest water is March 12, with an average temperature of 31°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Dillingham 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 Dillingham for general outdoor tourist activities is from mid July to mid August, with a peak score in the last week of July.

Tourism Score

Tourism Score in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec02468102.32.30.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Beach/Pool Score

Beach/Pool Score in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec02468100.10.10.00.0precipitationprecipitationcloudscloudstemperaturetemperature
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

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 in Dillingham typically lasts for 4.1 months (127 days), from around May 20 to around September 24, rarely starting before May 1 or after June 7, and rarely ending before September 5 or after October 11.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Dillinghamgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2050%May 2050%Sep 2450%Sep 2450%Jun 790%Jun 790%Sep 590%Sep 590%May 110%May 110%Oct 1110%Oct 1110%0%Dec 40%Dec 4Jul 15100%Jul 15100%frigidfreezingvery coldcoldcool
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within 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 in Dillingham should appear around June 19, only rarely appearing before June 3 or after July 11.

Growing Degree Days

Growing Degree Days in DillinghamJanFebMarAprMayJunJulAugSepOctNovDec0°F100°F200°F300°F400°F500°F600°F700°FJun 1990°FJun 1990°FDec 31504°FDec 31504°F
The average growing degree days accumulated over the course of the year, 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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.1 months, from April 30 to August 1, with an average daily incident shortwave energy per square meter above 4.4 kWh. The brightest day of the year is June 8, with an average of 5.5 kWh.

The darker period of the year lasts for 3.9 months, from October 21 to February 18, 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

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 Dillingham are 59.040 deg latitude, -158.458 deg longitude, and 13 ft elevation.

The topography within 2 miles of Dillingham contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 21 feet. Within 10 miles also contains only modest variations in elevation (299 feet). Within 50 miles contains only modest variations in elevation (3,553 feet).

The area within 2 miles of Dillingham is covered by water (68%), herbaceous vegetation (16%), and shrubs (13%), within 10 miles by shrubs (45%) and herbaceous vegetation (28%), and within 50 miles by shrubs (51%) and water (27%).

Data Sources

This report illustrates the typical weather in Dillingham, 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

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Dillingham.

For each station, the records are corrected for the elevation difference between that station and Dillingham according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Dillingham is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Dillingham and a given station.

The stations contributing to this reconstruction are: Dillingham Airport (97%, 3.6 kilometers, west); New Stuyahok Airport (1.2%, 79 kilometers, northeast); King Salmon Airport (0.7%, 111 kilometers, east); and Egegik Airport (0.7%, 114 kilometers, southeast).

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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

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.