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Average Weather at Merle K. (Mudhole) Smith Airport Alaska, United States

At Merle K. (Mudhole) Smith Airport, the summers are cool; the winters are long, freezing, and windy; and it is wet and overcast year round. Over the course of the year, the temperature typically varies from 22°F to 62°F and is rarely below 1°F or above 70°F.

Climate Summary

very coldcoldcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec34%34%23%23%overcastclearprecipitation: 15.5 inprecipitation: 15.5 in5.0 in5.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 2.2tourism score: 2.20.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Merle K. (Mudhole) Smith Airport for warm-weather activities is from early July to mid August.

Temperature

The warm season lasts for 3.6 months, from May 28 to September 15, with an average daily high temperature above 57°F. The hottest day of the year is July 30, with an average high of 62°F and low of 49°F.

The cold season lasts for 4.2 months, from November 9 to March 14, with an average daily high temperature below 39°F. The coldest day of the year is January 14, with an average low of 22°F and high of 34°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 at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingvery coldvery coldcoldcool
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.

Moi, Norway (4,085 miles away) and Hommelvik, Norway (3,791 miles) are the far-away foreign places with temperatures most similar to Merle K. (Mudhole) Smith Airport (view comparison).

Clouds

At Merle K. (Mudhole) Smith 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 Merle K. (Mudhole) Smith Airport begins around February 17 and lasts for 6.9 months, ending around September 13. On March 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 34% of the time, and overcast or mostly cloudy 66% of the time.

The cloudier part of the year begins around September 13 and lasts for 5.1 months, ending around February 17. On December 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 77% of the time, and clear, mostly clear, or partly cloudy 23% of the time.

Cloud Cover Categories

Cloud Cover Categories at Merle K. (Mudhole) Smith AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Mar 1634%Mar 1634%Dec 623%Dec 623%Sep 1329%Sep 1329%clearpartly cloudymostly cloudyovercastmostly clear
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 at Merle K. (Mudhole) Smith Airport varies throughout the year.

The wetter season lasts 6.4 months, from August 17 to February 28, with a greater than 53% chance of a given day being a wet day. The chance of a wet day peaks at 66% on October 5.

The drier season lasts 5.6 months, from February 28 to August 17. The smallest chance of a wet day is 39% on June 24.

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 66% on September 27.

Daily Chance of Precipitation

Daily Chance of Precipitation at Merle K. (Mudhole) Smith AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Oct 566%Oct 566%Jun 2439%Jun 2439%Jan 160%Jan 160%Aug 1753%Aug 1753%Feb 2853%Feb 2853%snowmixedrain
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. Merle K. (Mudhole) Smith Airport experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Merle K. (Mudhole) Smith Airport. The most rain falls during the 31 days centered around September 24, with an average total accumulation of 15.5 inches.

The least rain falls around June 23, with an average total accumulation of 5.0 inches.

Average Monthly Rainfall

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. Merle K. (Mudhole) Smith Airport experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 6.2 months, from October 15 to April 21, 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 5, with an average total liquid-equivalent accumulation of 1.2 inches.

The snowless period of the year lasts for 5.8 months, from April 21 to October 15. The least snow falls around July 18, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Merle K. (Mudhole) Smith AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 in12 in14 in16 inJan 51.2 inJan 51.2 inJul 180.0 inJul 180.0 inOct 150.1 inOct 150.1 inApr 210.1 inApr 210.1 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 at Merle K. (Mudhole) Smith Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 5 hours, 42 minutes of daylight; the longest day is June 20, with 19 hours, 4 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 10 minMar 2012 hr, 10 minMar 2019 hr, 4 minJun 2019 hr, 4 minJun 2012 hr, 13 minSep 2212 hr, 13 minSep 225 hr, 42 minDec 215 hr, 42 minDec 21nightnightday
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 4:11 AM on June 19, and the latest sunrise is 5 hours, 39 minutes later at 9:50 AM on December 26. The earliest sunset is at 3:30 PM on December 16, and the latest sunset is 7 hours, 46 minutes later at 11:15 PM on June 22.

Daylight saving time (DST) is observed at Merle K. (Mudhole) Smith 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

Sunrise & Sunset with Twilight and Daylight Saving Time at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 194:11 AMJun 194:11 AM11:15 PMJun 2211:15 PMJun 22Dec 163:30 PMDec 163:30 PM9:50 AMDec 269:50 AMDec 26Mar 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 at Merle K. (Mudhole) Smith 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

Humidity Comfort Levels at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 260%Feb 260%Aug 280%Aug 280%drydrycomfortablecomfortable
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 at Merle K. (Mudhole) Smith Airport experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 6.4 months, from September 23 to April 5, with average wind speeds of more than 10.6 miles per hour. The windiest day of the year is January 8, with an average hourly wind speed of 14.7 miles per hour.

The calmer time of year lasts for 5.6 months, from April 5 to September 23. The calmest day of the year is July 6, with an average hourly wind speed of 6.4 miles per hour.

Average Wind Speed

Average Wind Speed at Merle K. (Mudhole) Smith AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mph24 mphJan 814.7 mphJan 814.7 mphJul 66.4 mphJul 66.4 mphSep 2310.6 mphSep 2310.6 mphApr 510.6 mphApr 510.6 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 at Merle K. (Mudhole) Smith Airport is from the east throughout the year.

Wind Direction

Wind Direction at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorthsouth
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

Merle K. (Mudhole) Smith 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 16, with an average temperature above 53°F. The day of the year with the warmest water is August 3, with an average temperature of 57°F.

The time of year with cooler water lasts for 4.2 months, from December 23 to April 30, with an average temperature below 43°F. The day of the year with the coolest water is March 8, with an average temperature of 39°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 at Merle K. (Mudhole) Smith 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 Merle K. (Mudhole) Smith Airport for general outdoor tourist activities is from early July to mid August, with a peak score in the last week of July.

Tourism Score

Tourism Score at Merle K. (Mudhole) Smith Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468102.22.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
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. Based on this score, the best time of year to visit Merle K. (Mudhole) Smith Airport for hot-weather activities is from late June to early July.

Beach/Pool Score

Beach/Pool Score at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.10.10.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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 at Merle K. (Mudhole) Smith Airport typically lasts for 4.2 months (130 days), from around May 15 to around September 22, rarely starting before April 29 or after May 30, and rarely ending before September 4 or after October 9.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Merle K. (Mudhole) Smith Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1550%May 1550%Sep 2250%Sep 2250%May 3090%May 3090%Sep 490%Sep 490%Apr 2910%Apr 2910%Oct 910%Oct 910%0%Feb 180%Feb 18Jul 13100%Jul 13100%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 at Merle K. (Mudhole) Smith Airport should appear around June 13, only rarely appearing before May 28 or after July 3.

Growing Degree Days

Growing Degree Days at Merle K. (Mudhole) Smith AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F100°F200°F300°F400°F500°F600°FJun 1390°FJun 1390°FDec 31537°FDec 31537°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 2.9 months, from May 3 to July 30, with an average daily incident shortwave energy per square meter above 4.2 kWh. The brightest day of the year is June 18, with an average of 5.3 kWh.

The darker period of the year lasts for 4.4 months, from October 13 to February 24, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is December 19, with an average of 0.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Merle K. (Mudhole) Smith AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 185.3 kWhJun 185.3 kWhDec 190.1 kWhDec 190.1 kWhMay 34.2 kWhMay 34.2 kWhJul 304.2 kWhJul 304.2 kWhOct 131.2 kWhOct 131.2 kWhFeb 241.2 kWhFeb 241.2 kWh
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 Merle K. (Mudhole) Smith Airport are 60.492 deg latitude, -145.477 deg longitude, and 13 ft elevation.

The topography within 2 miles of Merle K. (Mudhole) Smith Airport contains only modest variations in elevation, with a maximum elevation change of 174 feet and an average elevation above sea level of 28 feet. Within 10 miles contains only modest variations in elevation (3,917 feet). Within 50 miles also contains extreme variations in elevation (7,907 feet).

The area within 2 miles of Merle K. (Mudhole) Smith Airport is covered by herbaceous vegetation (55%), trees (23%), and sparse vegetation (22%), within 10 miles by herbaceous vegetation (25%) and trees (21%), and within 50 miles by water (46%) and snow and glaciers (12%).

Data Sources

This report illustrates the typical weather at Merle K. (Mudhole) Smith 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

Merle K. (Mudhole) Smith 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 Valdez Airport; Valdez Weather Station Office; Middleton Island Airport; Skelton Airport; Whittier Airport; and Portage, Portage Glacier.

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.