May Weather in Marine Corps Base Hawaii - MCBH United States

Daily high temperatures are around 80°F, rarely falling below 77°F or exceeding 83°F.

Daily low temperatures are around 73°F, rarely falling below 69°F or exceeding 76°F.

For reference, on September 2, the hottest day of the year, temperatures in Marine Corps Base Hawaii - MCBH typically range from 77°F to 84°F, while on January 27, the coldest day of the year, they range from 70°F to 78°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.

Belmonte, Brazil (8,449 miles away) and Levuka, Fiji (3,144 miles) are the far-away foreign places with temperatures most similar to Marine Corps Base Hawaii - MCBH (view comparison).

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The month of May in Marine Corps Base Hawaii - MCBH experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 32% to 27%.

The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 73% of the time.

For reference, on October 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on January 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Marine Corps Base Hawaii - MCBH, the chance of a wet day over the course of May is rapidly decreasing, starting the month at 14% and ending it at 7%.

For reference, the year's highest daily chance of a wet day is 25% on January 11, and its lowest chance is 5% on June 19.

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 in Marine Corps Base Hawaii - MCBH is decreasing, starting the month at 1.1 inches, when it rarely exceeds 3.2 inches, and ending the month at 0.3 inches, when it rarely exceeds 0.9 inches or falls below -0.0 inches.

Over the course of May in Marine Corps Base Hawaii - MCBH, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 24 minutes, implying an average daily increase of 48 seconds, and weekly increase of 5 minutes, 37 seconds.

The shortest day of the month is May 1, with 12 hours, 57 minutes of daylight and the longest day is May 31, with 13 hours, 21 minutes of daylight.

The latest sunrise of the month in Marine Corps Base Hawaii - MCBH is 5:59 AM on May 1 and the earliest sunrise is 11 minutes earlier at 5:48 AM on May 31.

The earliest sunset is 6:56 PM on May 1 and the latest sunset is 13 minutes later at 7:09 PM on May 31.

Daylight saving time is not observed in Marine Corps Base Hawaii - MCBH during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:49 AM and sets 13 hours, 26 minutes later, at 7:16 PM, while on December 21, the shortest day of the year, it rises at 7:04 AM and sets 10 hours, 50 minutes later, at 5:54 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 in Marine Corps Base Hawaii - MCBH is very rapidly increasing during May, rising from 58% to 81% over the course of the month.

For reference, on August 24, the muggiest day of the year, there are muggy conditions 98% of the time, while on March 5, the least muggy day of the year, there are muggy conditions 39% 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 in Marine Corps Base Hawaii - MCBH is essentially constant during May, remaining within 0.4 miles per hour of 14.7 miles per hour throughout.

For reference, on July 2, the windiest day of the year, the daily average wind speed is 16.9 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.5 miles per hour.

The lowest daily average wind speed during May is 14.3 miles per hour on May 18.

The hourly average wind direction in Marine Corps Base Hawaii - MCBH throughout May is predominantly from the east, with a peak proportion of 89% on May 31.

Marine Corps Base Hawaii - MCBH 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 in Marine Corps Base Hawaii - MCBH is essentially constant during May, remaining within 1°F of 77°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).

Temperatures in Marine Corps Base Hawaii - MCBH are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 Marine Corps Base Hawaii - MCBH are rapidly increasing during May, increasing by 787°F, from 2,880°F to 3,667°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 in Marine Corps Base Hawaii - MCBH is essentially constant during May, remaining within 0.2 kWh of 7.4 kWh throughout.

For the purposes of this report, the geographical coordinates of Marine Corps Base Hawaii - MCBH are 21.443 deg latitude, -157.750 deg longitude, and 20 ft elevation.

The topography within 2 miles of Marine Corps Base Hawaii - MCBH contains significant variations in elevation, with a maximum elevation change of 620 feet and an average elevation above sea level of 28 feet. Within 10 miles contains significant variations in elevation (3,117 feet). Within 50 miles contains large variations in elevation (4,117 feet).

The area within 2 miles of Marine Corps Base Hawaii - MCBH is covered by water (48%) and artificial surfaces (42%), within 10 miles by water (62%) and trees (22%), and within 50 miles by water (91%).