April Weather at Adak Airport United States

Daily high temperatures increase by 3°F, from 39°F to 42°F, rarely falling below 35°F or exceeding 46°F.

Daily low temperatures increase by 3°F, from 32°F to 35°F, rarely falling below 27°F or exceeding 38°F.

For reference, on August 12, the hottest day of the year, temperatures at Adak Airport typically range from 47°F to 56°F, while on January 24, the coldest day of the year, they range from 29°F to 35°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Ólafsvík, Iceland (4,245 miles away) is the far-away foreign place with temperatures most similar to Adak Airport (view comparison).

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The month of April at Adak Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 70% to 65%. The lowest chance of overcast or mostly cloudy conditions is 64% on April 15.

The clearest day of the month is April 15, with clear, mostly clear, or partly cloudy conditions 36% of the time.

For reference, on July 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 87%, while on October 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 41%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Adak Airport, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 29% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 40% on November 11, and its lowest chance is 20% on May 4.

Over the course of April at Adak Airport, the chance of a day with only rain decreases from 26% to 21%, the chance of a day with mixed snow and rain decreases from 3% to 1%, and the chance of a day with only snow remains an essentially constant 0% throughout.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during April at Adak Airport is gradually decreasing, starting the month at 1.8 inches, when it rarely exceeds 3.3 inches or falls below 0.6 inches, and ending the month at 1.5 inches, when it rarely exceeds 2.8 inches or falls below 0.5 inches.

Over the course of April at Adak Airport, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 51 minutes, implying an average daily increase of 3 minutes, 50 seconds, and weekly increase of 26 minutes, 51 seconds.

The shortest day of the month is April 1, with 13 hours, 2 minutes of daylight and the longest day is April 30, with 14 hours, 53 minutes of daylight.

The latest sunrise of the month at Adak Airport is 8:19 AM on April 1 and the earliest sunrise is 1 hour, 2 minutes earlier at 7:17 AM on April 30.

The earliest sunset is 9:21 PM on April 1 and the latest sunset is 49 minutes later at 10:10 PM on April 30.

Daylight saving time is observed at Adak Airport during 2024, but it neither starts nor ends during April, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:27 AM and sets 16 hours, 43 minutes later, at 11:09 PM, while on December 21, the shortest day of the year, it rises at 9:52 AM and sets 7 hours, 46 minutes later, at 5:38 PM.

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.

The figure below presents a compact representation of key lunar data for April 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 chance that a given day will be muggy at Adak Airport is essentially constant during April, remaining around 0% throughout.

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 Adak Airport is rapidly decreasing during April, decreasing from 19.8 miles per hour to 17.6 miles per hour over the course of the month.

For reference, on November 19, the windiest day of the year, the daily average wind speed is 21.7 miles per hour, while on July 20, the calmest day of the year, the daily average wind speed is 12.0 miles per hour.

The hourly average wind direction at Adak Airport throughout April is predominantly from the west, with a peak proportion of 36% on April 9.

Adak 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 surface water temperature at Adak Airport is essentially constant during April, remaining around 39°F throughout.

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 Adak Airport typically lasts for 5.7 months (175 days), from around May 1 to around October 23, rarely starting before April 9 or after May 23, and rarely ending before September 27 or after November 20.

The month of April at Adak Airport is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 5% to 48% over the course of the month.

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.

The average accumulated growing degree days at Adak Airport are essentially constant during April, remaining around 0°F throughout.

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 at Adak Airport is increasing during April, rising by 1.3 kWh, from 2.9 kWh to 4.2 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Adak Airport are 51.878 deg latitude, -176.646 deg longitude, and 10 ft elevation.

The topography within 2 miles of Adak Airport contains significant variations in elevation, with a maximum elevation change of 663 feet and an average elevation above sea level of 124 feet. Within 10 miles contains significant variations in elevation (3,819 feet). Within 50 miles also contains extreme variations in elevation (5,889 feet).

The area within 2 miles of Adak Airport is covered by water (48%), shrubs (39%), and grassland (10%), within 10 miles by water (56%) and shrubs (28%), and within 50 miles by water (94%).