April Weather in Grand Teton National Park Wyoming, United States

Daily high temperatures increase by 11°F, from 44°F to 55°F, rarely falling below 34°F or exceeding 69°F.

Daily low temperatures increase by 8°F, from 22°F to 30°F, rarely falling below 9°F or exceeding 37°F.

For reference, on July 27, the hottest day of the year, temperatures in Grand Teton National Park typically range from 44°F to 80°F, while on January 27, the coldest day of the year, they range from 6°F to 25°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.

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The month of April in Grand Teton National Park experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 55% throughout the month.

The clearest day of the month is April 28, with clear, mostly clear, or partly cloudy conditions 47% of the time.

For reference, on March 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grand Teton National Park, the chance of a wet day over the course of April is increasing, starting the month at 22% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 32% on May 29, and its lowest chance is 14% on July 3.

Over the course of April in Grand Teton National Park, the chance of a day with only rain increases from 9% to 21%, the chance of a day with mixed snow and rain decreases from 7% to 4%, and the chance of a day with only snow decreases from 5% 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 in Grand Teton National Park is increasing, starting the month at 0.8 inches, when it rarely exceeds 1.5 inches or falls below 0.2 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.6 inches or falls below 0.5 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 in Grand Teton National Park is decreasing, starting the month at 3.9 inches, when it rarely exceeds 7.9 inches or falls below 0.7 inches, and ending the month at 1.4 inches, when it rarely exceeds 3.4 inches or falls below 0.1 inches.

Over the course of April in Grand Teton National Park, 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, 22 minutes, implying an average daily increase of 2 minutes, 51 seconds, and weekly increase of 19 minutes, 54 seconds.

The shortest day of the month is April 1, with 12 hours, 47 minutes of daylight and the longest day is April 30, with 14 hours, 10 minutes of daylight.

The latest sunrise of the month in Grand Teton National Park is 7:03 AM on April 1 and the earliest sunrise is 48 minutes earlier at 6:15 AM on April 30.

The earliest sunset is 7:50 PM on April 1 and the latest sunset is 35 minutes later at 8:25 PM on April 30.

Daylight saving time is observed in Grand Teton National Park during 2024, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:40 AM and sets 15 hours, 28 minutes later, at 9:08 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 55 minutes later, at 4:48 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 in Grand Teton National Park 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 in Grand Teton National Park is essentially constant during April, remaining within 0.1 miles per hour of 5.3 miles per hour throughout.

For reference, on March 29, the windiest day of the year, the daily average wind speed is 5.4 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.

The hourly average wind direction in Grand Teton National Park throughout April is predominantly from the west, with a peak proportion of 45% on April 20.

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 Grand Teton National Park typically lasts for 2.4 months (72 days), from around June 18 to around August 29, rarely starting before May 24 or after July 11, and rarely ending before August 6 or after September 17.

The month of April in Grand Teton National Park is reliably fully outside of 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.

The average accumulated growing degree days in Grand Teton National Park are essentially constant during April, remaining within 13°F of 15°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 in Grand Teton National Park is gradually increasing during April, rising by 0.9 kWh, from 5.4 kWh to 6.3 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Grand Teton National Park are 43.790 deg latitude, -110.682 deg longitude, and 6,424 ft elevation.

The topography within 2 miles of Grand Teton National Park contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 6,923 feet. Within 10 miles contains only modest variations in elevation (7,192 feet). Within 50 miles also contains extreme variations in elevation (8,694 feet).

The area within 2 miles of Grand Teton National Park is covered by shrubs (54%) and trees (40%), within 10 miles by shrubs (45%) and trees (27%), and within 50 miles by trees (44%) and shrubs (36%).