April Weather at Fort Yukon Airport United States

Daily high temperatures increase by 22°F, from 26°F to 47°F, rarely falling below 11°F or exceeding 59°F.

Daily low temperatures increase by 23°F, from 3°F to 26°F, rarely falling below -14°F or exceeding 36°F.

For reference, on July 2, the hottest day of the year, temperatures at Fort Yukon Airport typically range from 54°F to 73°F, while on January 19, the coldest day of the year, they range from -24°F to -9°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.

Markovo, Russia (3,112 miles away) is the far-away foreign place with temperatures most similar to Fort Yukon Airport (view comparison).

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The month of April at Fort Yukon Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 67% to 60%. The highest chance of overcast or mostly cloudy conditions is 67% on April 8.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 40% of the time.

For reference, on December 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 69%, while on May 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Fort Yukon Airport, the chance of a wet day over the course of April is gradually increasing, starting the month at 5% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 23% on August 22, and its lowest chance is 4% on March 18.

Over the course of April at Fort Yukon Airport, the chance of a day with only rain increases from 0% to 5%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow decreases from 4% to 1%.

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 Fort Yukon Airport is gradually increasing, starting the month at 0.0 inches, when it rarely exceeds 0.1 inches or falls below -0.0 inches, and ending the month at 0.3 inches, when it rarely exceeds 0.7 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during April at Fort Yukon Airport is gradually decreasing, starting the month at 1.6 inches, when it rarely exceeds 3.8 inches, and ending the month at 1.0 inches, when it rarely exceeds 3.2 inches or falls below -0.0 inches.

Due to its extreme latitude, Fort Yukon Airport experiences polar day (also known as the midnight Sun) during the summer. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.

Neither polar day nor polar night occur during the month of April.

Over the course of April at Fort Yukon Airport, the length of the day is very rapidly increasing. From the start to the end of the month, the length of the day increases by 3 hours, 41 minutes, implying an average daily increase of 7 minutes, 38 seconds, and weekly increase of 53 minutes, 25 seconds.

The shortest day of the month is April 1, with 13 hours, 50 minutes of daylight and the longest day is April 30, with 17 hours, 32 minutes of daylight.

The latest sunrise of the month at Fort Yukon Airport is 6:50 AM on April 1 and the earliest sunrise is 1 hour, 57 minutes earlier at 4:53 AM on April 30.

The earliest sunset is 8:40 PM on April 1 and the latest sunset is 1 hour, 45 minutes later at 10:25 PM on April 30.

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

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 Fort Yukon 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 Fort Yukon Airport is gradually decreasing during April, decreasing from 7.0 miles per hour to 6.3 miles per hour over the course of the month.

For reference, on March 11, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on August 31, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.

The hourly average wind direction at Fort Yukon Airport throughout April is predominantly from the north, with a peak proportion of 47% on April 19.

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 Fort Yukon Airport typically lasts for 3.4 months (105 days), from around May 19 to around September 2, rarely starting before May 3 or after June 5, and rarely ending before August 15 or after September 20.

The month of April at Fort Yukon Airport is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually increasing from 0% to 6% 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 Fort Yukon Airport are essentially constant during April, remaining within 3°F of 3°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 Fort Yukon Airport is rapidly increasing during April, rising by 1.8 kWh, from 2.9 kWh to 4.7 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Fort Yukon Airport are 66.571 deg latitude, -145.250 deg longitude, and 420 ft elevation.

The topography within 2 miles of Fort Yukon Airport is essentially flat, with a maximum elevation change of 39 feet and an average elevation above sea level of 429 feet. Within 10 miles is also essentially flat (69 feet). Within 50 miles is essentially flat (1,155 feet).

The area within 2 miles of Fort Yukon Airport is covered by trees (66%), sparse vegetation (20%), and water (12%), within 10 miles by trees (75%) and sparse vegetation (12%), and within 50 miles by trees (62%) and shrubs (18%).