May Weather at The Dalles Municipal Airport Washington, United States

Daily high temperatures increase by 6°F, from 70°F to 77°F, rarely falling below 60°F or exceeding 90°F.

Daily low temperatures increase by 7°F, from 46°F to 53°F, rarely falling below 38°F or exceeding 61°F.

For reference, on August 2, the hottest day of the year, temperatures at The Dalles Municipal Airport typically range from 62°F to 90°F, while on December 31, the coldest day of the year, they range from 29°F to 41°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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.

Skopje, Macedonia (5,967 miles away) is the far-away foreign place with temperatures most similar to The Dalles Municipal Airport (view comparison).

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The month of May at The Dalles Municipal Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 53% to 48%.

The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 52% of the time.

For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 83%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At The Dalles Municipal Airport, the chance of a wet day over the course of May is gradually decreasing, starting the month at 26% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 51% on November 27, and its lowest chance is 4% on August 4.

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 May at The Dalles Municipal Airport is gradually decreasing, starting the month at 1.8 inches, when it rarely exceeds 3.2 inches or falls below 0.6 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.8 inches or falls below 0.3 inches.

Over the course of May at The Dalles Municipal 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, 6 minutes, implying an average daily increase of 2 minutes, 12 seconds, and weekly increase of 15 minutes, 25 seconds.

The shortest day of the month is May 1, with 14 hours, 21 minutes of daylight and the longest day is May 31, with 15 hours, 27 minutes of daylight.

The latest sunrise of the month at The Dalles Municipal Airport is 5:51 AM on May 1 and the earliest sunrise is 32 minutes earlier at 5:19 AM on May 31.

The earliest sunset is 8:12 PM on May 1 and the latest sunset is 34 minutes later at 8:46 PM on May 31.

Daylight saving time is observed at The Dalles Municipal Airport during 2024, but it neither starts nor ends during May, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:15 AM and sets 15 hours, 42 minutes later, at 8:57 PM, while on December 21, the shortest day of the year, it rises at 7:42 AM and sets 8 hours, 41 minutes later, at 4:23 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 May 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 The Dalles Municipal Airport is essentially constant during May, remaining around 0% throughout.

For reference, on August 3, the muggiest day of the year, there are muggy conditions 1% of the time, while on September 23, the least muggy day of the year, there are muggy conditions 0% of the time.

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 The Dalles Municipal Airport is essentially constant during May, remaining within 0.1 miles per hour of 6.3 miles per hour throughout.

For reference, on June 6, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on October 6, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.

The hourly average wind direction at The Dalles Municipal Airport throughout May is predominantly from the west, with a peak proportion of 83% on May 31.

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 The Dalles Municipal Airport typically lasts for 6.6 months (202 days), from around April 8 to around October 27, rarely starting before March 19 or after April 28, and rarely ending before October 10 or after November 13.

The month of May at The Dalles Municipal Airport is very likely fully within the growing season, with the chance that a given day is in the growing season gradually increasing from 93% to 100% 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 The Dalles Municipal Airport are increasing during May, increasing by 340°F, from 255°F to 594°F, over the course of the month.

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 The Dalles Municipal Airport is gradually increasing during May, rising by 0.9 kWh, from 5.9 kWh to 6.7 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of The Dalles Municipal Airport are 45.618 deg latitude, -121.173 deg longitude, and 220 ft elevation.

The topography within 2 miles of The Dalles Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 285 feet and an average elevation above sea level of 183 feet. Within 10 miles contains only modest variations in elevation (3,146 feet). Within 50 miles contains large variations in elevation (12,274 feet).

The area within 2 miles of The Dalles Municipal Airport is covered by artificial surfaces (41%), cropland (28%), and grassland (17%), within 10 miles by shrubs (40%) and grassland (33%), and within 50 miles by shrubs (52%) and trees (34%).