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Climate and Average Weather Year Round in Girdwood Alaska, United States

In Girdwood, the summers are cool, wet, and overcast and the winters are long, freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 16°F to 64°F and is rarely below -9°F or above 72°F.

Based on the tourism score, the best time of year to visit Girdwood for warm-weather activities is from late June to early August.

Climate in Girdwood

freezingvery coldcoldcoolcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow41%41%28%28%overcastclearprecipitation: 7.0 inprecipitation: 7.0 in2.5 in2.5 inmuggy: 0%muggy: 0%drydrytourism score: 2.6tourism score: 2.60.00.0
Girdwood weather by month. Click on each chart for more information.

The warm season lasts for 3.6 months, from May 21 to September 8, with an average daily high temperature above 57°F. The hottest month of the year in Girdwood is July, with an average high of 64°F and low of 50°F.

The cold season lasts for 4.4 months, from November 4 to March 16, with an average daily high temperature below 34°F. The coldest month of the year in Girdwood is January, with an average low of 16°F and high of 28°F.

Average High and Low Temperature in Girdwood

Average High and Low Temperature in GirdwoodwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2027°FJan 2027°FJul 664°FJul 664°F16°F16°F49°F49°FMay 2157°FMay 2157°FSep 857°FSep 857°FNov 434°FNov 434°FMar 1634°FMar 1634°F40°F40°F44°F44°F24°F24°F20°F20°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 28°F30°F35°F42°F54°F62°F64°F62°F54°F42°F32°F28°F
Temp. 21°F24°F26°F35°F46°F54°F56°F55°F48°F37°F26°F23°F
Low 16°F17°F20°F29°F39°F46°F50°F48°F41°F31°F21°F17°F

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 in Girdwood

Average Hourly Temperature in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcool
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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© OpenStreetMap contributors

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In Girdwood, 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 Girdwood begins around February 16 and lasts for 2.4 months, ending around April 29.

The clearest month of the year in Girdwood is March, during which on average the sky is clear, mostly clear, or partly cloudy 39% of the time.

The cloudier part of the year begins around April 29 and lasts for 9.6 months, ending around February 16.

The cloudiest month of the year in Girdwood is December, during which on average the sky is overcast or mostly cloudy 71% of the time.

Cloud Cover Categories in Girdwood

Cloud Cover Categories in GirdwoodclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Mar 1541%Mar 1541%Dec 1728%Dec 1728%Apr 2935%Apr 2935%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 69%65%61%63%65%67%69%67%68%66%66%71%
Clearer 31%35%39%37%35%33%31%33%32%34%34%29%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Girdwood varies throughout the year.

The wetter season lasts 6.2 months, from July 24 to February 3, with a greater than 45% chance of a given day being a wet day. The month with the most wet days in Girdwood is September, with an average of 16.4 days with at least 0.04 inches of precipitation.

The drier season lasts 5.7 months, from February 3 to July 24. The month with the fewest wet days in Girdwood is May, with an average of 10.9 days with at least 0.04 inches of precipitation.

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 Girdwood changes throughout the year.

Rain alone is the most common for 11 months, from January 3 to November 26. The month with the most days of rain alone in Girdwood is September, with an average of 16.3 days.

Snow alone is the most common for 1.2 months, from November 26 to January 3. The month with the most days of snow alone in Girdwood is December, with an average of 6.0 days.

Daily Chance of Precipitation in Girdwood

Daily Chance of Precipitation in GirdwoodrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Sep 2357%Sep 2357%May 1434%May 1434%Jan 348%Jan 348%Nov 2648%Nov 2648%Jul 2445%Jul 2445%NowNowsnowmixedrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 5.7d4.8d5.4d8.6d10.6d11.2d13.2d15.2d16.3d12.7d6.4d5.1d
Mixed 3.8d3.6d3.4d2.0d0.2d0.0d0.0d0.0d0.1d1.8d3.3d4.2d
Snow 5.1d3.9d3.0d0.8d0.0d0.0d0.0d0.0d0.0d0.9d4.2d6.0d
Any 14.6d12.3d11.8d11.4d10.9d11.2d13.2d15.2d16.4d15.4d13.9d15.2d

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. Girdwood experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Girdwood. The month with the most rain in Girdwood is September, with an average rainfall of 7.0 inches.

The month with the least rain in Girdwood is March, with an average rainfall of 1.9 inches.

Average Monthly Rainfall in Girdwood

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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.9″2.2″1.9″2.5″2.5″2.8″4.0″5.8″7.0″5.3″3.0″2.8″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Girdwood experiences extreme seasonal variation in monthly snowfall.

The snowy period of the year lasts for 7.2 months, from September 29 to May 2, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Girdwood is December, with an average snowfall of 18.1 inches.

The snowless period of the year lasts for 4.9 months, from May 2 to September 29. The least snow falls around July 23, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Girdwood

Average Monthly Snowfall in GirdwoodsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 in30 in30 in35 in35 inDec 1318.4 inDec 1318.4 inJul 230.0 inJul 230.0 inSep 291.0 inSep 291.0 inMay 21.0 inMay 21.0 inNowNow
The average 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 15.1″14.6″10.5″3.6″0.2″0.0″0.0″0.0″0.1″4.5″14.1″18.1″

The length of the day in Girdwood varies extremely over the course of the year. In 2024, the shortest day is December 21, with 5 hours, 33 minutes of daylight; the longest day is June 20, with 19 hours, 15 minutes of daylight.

Hours of Daylight and Twilight in Girdwood

Hours of Daylight and Twilight in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 12 minMar 1912 hr, 12 minMar 1919 hr, 15 minJun 2019 hr, 15 minJun 2012 hr, 17 minSep 2212 hr, 17 minSep 225 hr, 33 minDec 215 hr, 33 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 6.6h9.1h11.9h14.8h17.5h19.1h18.2h15.6h12.8h10.0h7.3h5.7h

The earliest sunrise is at 4:20 AM on June 18, and the latest sunrise is 5 hours, 49 minutes later at 10:09 AM on December 25. The earliest sunset is at 3:40 PM on December 15, and the latest sunset is 7 hours, 56 minutes later at 11:36 PM on June 22.

Daylight saving time (DST) is observed in Girdwood during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Girdwood

Sunrise & Sunset with Twilight and Daylight Saving Time in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 184:20 AMJun 184:20 AM11:36 PMJun 2211:36 PMJun 22Dec 153:40 PMDec 153:40 PM10:09 AMDec 2510:09 AMDec 25Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Girdwood

Solar Elevation and Azimuth in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM00010101020203030405000010101020203030404050652NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Girdwood

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Girdwood, 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 in Girdwood

Humidity Comfort Levels in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 20%Jul 20%NowNowdrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Girdwood experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from November 5 to April 15, with average wind speeds of more than 6.5 miles per hour. The windiest month of the year in Girdwood is January, with an average hourly wind speed of 7.7 miles per hour.

The calmer time of year lasts for 6.7 months, from April 15 to November 5. The calmest month of the year in Girdwood is July, with an average hourly wind speed of 5.3 miles per hour.

Average Wind Speed in Girdwood

Average Wind Speed in GirdwoodwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphJan 87.9 mphJan 87.9 mphJul 55.2 mphJul 55.2 mphNov 56.5 mphNov 56.5 mphApr 156.5 mphApr 156.5 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 7.77.46.96.55.95.55.35.76.66.56.87.4

The predominant average hourly wind direction in Girdwood is from the east throughout the year.

Wind Direction in Girdwood

Wind Direction in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
northeastsouthwest
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 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Girdwood 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 2.9 months, from June 24 to September 20, with an average temperature above 52°F. The month of the year in Girdwood with the warmest water is August, with an average temperature of 56°F.

The time of year with cooler water lasts for 5.4 months, from November 29 to May 11, with an average temperature below 39°F. The month of the year in Girdwood with the coolest water is February, with an average temperature of 34°F.

Average Water Temperature in Girdwood

Average Water Temperature in GirdwoodwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°FAug 656°FAug 656°F34°FMar 134°FMar 1Jun 2452°FJun 2452°FSep 2052°FSep 2052°FNov 2939°FNov 2939°FMay 1139°FMay 1139°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 35°F34°F34°F35°F40°F49°F55°F56°F53°F47°F41°F37°F

To characterize how pleasant the weather is in Girdwood 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 Girdwood for general outdoor tourist activities is from late June to early August, with a peak score in the third week of July.

Tourism Score in Girdwood

Tourism Score in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.62.60.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Girdwood for hot-weather activities is from early to mid July.

Beach/Pool Score in Girdwood

Beach/Pool Score in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.10.10.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
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.

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 Girdwood typically lasts for 4.5 months (138 days), from around May 8 to around September 23, rarely starting before April 20 or after May 26, and rarely ending before September 6 or after October 10.

Time Spent in Various Temperature Bands and the Growing Season in Girdwood

Time Spent in Various Temperature Bands and the Growing Season in Girdwoodgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 850%May 850%Sep 2350%Sep 2350%May 2690%May 2690%Sep 690%Sep 690%Apr 2010%Apr 2010%Oct 1010%Oct 1010%0%Feb 160%Feb 16Jul 19100%Jul 19100%NowNowfrigidfreezingvery coldcoldcool
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 percentage of time spent in various temperature bands. 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 Girdwood should appear around June 10, only rarely appearing before May 30 or after June 25.

Growing Degree Days in Girdwood

Growing Degree Days in GirdwoodJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F100°F100°F200°F200°F300°F300°F400°F400°F500°F500°F600°F600°F700°F700°FJun 1090°FJun 1090°FDec 31608°FDec 31608°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 26 to July 24, with an average daily incident shortwave energy per square meter above 4.5 kWh. The brightest month of the year in Girdwood is June, 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 month of the year in Girdwood is December, with an average of 0.2 kWh.

Average Daily Incident Shortwave Solar Energy in Girdwood

Average Daily Incident Shortwave Solar Energy in GirdwoodbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 85.6 kWhJun 85.6 kWhDec 200.1 kWhDec 200.1 kWhApr 264.5 kWhApr 264.5 kWhJul 244.5 kWhJul 244.5 kWhOct 161.2 kWhOct 161.2 kWhFeb 211.2 kWhFeb 211.2 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 0.31.02.54.05.25.54.83.72.41.20.50.2

For the purposes of this report, the geographical coordinates of Girdwood are 60.943 deg latitude, -149.166 deg longitude, and 36 ft elevation.

The topography within 2 miles of Girdwood contains extreme variations in elevation, with a maximum elevation change of 3,435 feet and an average elevation above sea level of 473 feet. Within 10 miles also contains extreme variations in elevation (6,542 feet). Within 50 miles also contains extreme variations in elevation (10,561 feet).

The area within 2 miles of Girdwood is covered by trees (39%), water (34%), and shrubs (11%), within 10 miles by shrubs (30%) and trees (19%), and within 50 miles by shrubs (22%) and trees (21%).

This report illustrates the typical weather in Girdwood, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Girdwood.

For each station, the records are corrected for the elevation difference between that station and Girdwood 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 Girdwood is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Girdwood and a given station.

The stations contributing to this reconstruction are:

  • Portage, Portage Glacier (PATO, 71%, 15 mi, southeast, 66 ft elevation change)
  • Bryant Army Heliport (PAFR, 29%, 28 mi, northwest, 351 ft elevation change)

Sources mapPATO, 71%15 mi, 66 ftPAFR, 29%28 mi, 351 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Girdwood and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

Please review our full terms contained on our Terms of Service page.