May Weather in Charlotte Amalie U.S. Virgin Islands

Daily high temperatures are around 86°F, rarely falling below 82°F or exceeding 91°F.

Daily low temperatures increase by 2°F, from 76°F to 78°F, rarely falling below 74°F or exceeding 81°F.

For reference, on August 6, the hottest day of the year, temperatures in Charlotte Amalie typically range from 79°F to 89°F, while on January 21, the coldest day of the year, they range from 73°F to 83°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.

Malindi, Kenya (7,283 miles away); Vũng Tàu, Vietnam (10,393 miles); and Pandan, Philippines (10,126 miles) are the far-away foreign places with temperatures most similar to Charlotte Amalie (view comparison).

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The month of May in Charlotte Amalie experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 46% to 72%. The highest chance of overcast or mostly cloudy conditions is 72% on May 30.

The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 54% of the time.

For reference, on May 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on January 11, 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. In Charlotte Amalie, the chance of a wet day over the course of May is rapidly increasing, starting the month at 23% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 38% on September 20, and its lowest chance is 11% on March 8.

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 Charlotte Amalie is gradually increasing, starting the month at 2.1 inches, when it rarely exceeds 4.7 inches or falls below 0.2 inches, and ending the month at 2.4 inches, when it rarely exceeds 5.5 inches or falls below 0.4 inches.

The highest average 31-day accumulation is 2.7 inches on May 21.

Over the course of May in Charlotte Amalie, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 21 minutes, implying an average daily increase of 41 seconds, and weekly increase of 4 minutes, 50 seconds.

The shortest day of the month is May 1, with 12 hours, 48 minutes of daylight and the longest day is May 31, with 13 hours, 9 minutes of daylight.

The latest sunrise of the month in Charlotte Amalie is 5:52 AM on May 1 and the earliest sunrise is 10 minutes earlier at 5:42 AM on May 31.

The earliest sunset is 6:41 PM on May 1 and the latest sunset is 11 minutes later at 6:52 PM on May 31.

Daylight saving time is not observed in Charlotte Amalie during 2023.

For reference, on June 21, the longest day of the year, the Sun rises at 5:44 AM and sets 13 hours, 14 minutes later, at 6:58 PM, while on December 22, the shortest day of the year, it rises at 6:47 AM and sets 11 hours, 2 minutes later, at 5:49 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 2023. 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 Charlotte Amalie is gradually increasing during May, rising from 94% to 97% over the course of the month.

For reference, on August 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 27, the least muggy day of the year, there are muggy conditions 71% 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 Charlotte Amalie is gradually increasing during May, increasing from 13.1 miles per hour to 13.7 miles per hour over the course of the month.

For reference, on July 14, the windiest day of the year, the daily average wind speed is 16.0 miles per hour, while on October 10, the calmest day of the year, the daily average wind speed is 11.8 miles per hour.

The lowest daily average wind speed during May is 13.1 miles per hour on May 4.

The hourly average wind direction in Charlotte Amalie throughout May is predominantly from the east, with a peak proportion of 93% on May 31.

Charlotte Amalie 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 Charlotte Amalie is essentially constant during May, remaining within 1°F of 81°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 Charlotte Amalie 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 Charlotte Amalie are very rapidly increasing during May, increasing by 932°F, from 3,395°F to 4,327°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 Charlotte Amalie is decreasing during May, falling by 1.1 kWh, from 6.7 kWh to 5.6 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Charlotte Amalie are 18.342 deg latitude, -64.931 deg longitude, and 33 ft elevation.

The topography within 2 miles of Charlotte Amalie contains very significant variations in elevation, with a maximum elevation change of 1,558 feet and an average elevation above sea level of 296 feet. Within 10 miles also contains very significant variations in elevation (1,604 feet). Within 50 miles also contains very significant variations in elevation (1,781 feet).

The area within 2 miles of Charlotte Amalie is covered by grassland (38%), water (23%), and trees (23%), within 10 miles by water (91%), and within 50 miles by water (97%).