Average Weather in May in Basseterre St. Kitts & Nevis
In Basseterre, the month of May is characterized by essentially constant daily high temperatures, with daily highs around 86°F throughout the month, rarely exceeding 88°F or dropping below 83°F.
Daily low temperatures increase by 2°F, from 77°F to 79°F, rarely falling below 75°F or exceeding 81°F.
For reference, on August 25, the hottest day of the year, temperatures in Basseterre typically range from 80°F to 88°F, while on February 12, the coldest day of the year, they range from 75°F to 82°F.
Average High and Low Temperature in May
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.
Average Hourly Temperature in May
The month of May in Basseterre experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 49% to 68%. The highest chance of overcast or mostly cloudy conditions is 68% on May 30.
The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 51% of the time.
For reference, on May 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on January 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.
Cloud Cover in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Basseterre, the chance of a wet day over the course of May is essentially constant, remaining around 19% throughout.
For reference, the year's highest daily chance of a wet day is 29% on September 7, and its lowest chance is 5% on January 28.
Probability of Precipitation in May
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 Basseterre is essentially constant, remaining about 1.7 inches throughout, and rarely exceeding 4.4 inches or falling below 0.1 inches.
The highest average 31-day accumulation is 1.8 inches on May 11.
Average Monthly Rainfall in May
Over the course of May in Basseterre, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 19 minutes, implying an average daily increase of 39 seconds, and weekly increase of 4 minutes, 30 seconds.
The shortest day of the month is May 1, with 12 hours, 46 minutes of daylight and the longest day is May 31, with 13 hours, 6 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Basseterre is 5:44 AM on May 1 and the earliest sunrise is 9 minutes earlier at 5:35 AM on May 31.
The earliest sunset is 6:31 PM on May 1 and the latest sunset is 10 minutes later at 6:41 PM on May 31.
Daylight saving time is not observed in Basseterre during 2017.
For reference, on June 21, the longest day of the year, the Sun rises at 5:37 AM and sets 13 hours, 10 minutes later, at 6:47 PM, while on December 21, the shortest day of the year, it rises at 6:36 AM and sets 11 hours, 6 minutes later, at 5:42 PM.
Sunrise & Sunset with Twilight in May
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 Basseterre is essentially constant during May, remaining around 100% throughout.
For reference, on May 19, the muggiest day of the year, there are muggy conditions 100% of the time, while on March 6, the least muggy day of the year, there are muggy conditions 90% of the time.
Humidity Comfort Levels in May
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 Basseterre is essentially constant during May, remaining within 0.2 miles per hour of 7.8 miles per hour throughout.
For reference, on July 11, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on October 10, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.
The lowest daily average wind speed during May is 7.5 miles per hour on May 4.
Average Wind Speed in May
Wind Direction in May
Basseterre 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 Basseterre is essentially constant during May, remaining within 1°F of 81°F throughout.
Average Water Temperature in May
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 Basseterre is gradually decreasing during May, falling by 0.9 kWh, from 6.8 kWh to 6.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Basseterre are 17.295 deg latitude, -62.726 deg longitude, and 16 ft elevation.
The topography within 2 miles of Basseterre contains very significant variations in elevation, with a maximum elevation change of 1,135 feet and an average elevation above sea level of 153 feet. Within 10 miles contains very significant variations in elevation (3,445 feet). Within 50 miles also contains extreme variations in elevation (3,471 feet).
The area within 2 miles of Basseterre is covered by water (36%), grassland (21%), cropland (17%), and trees (16%), within 10 miles by water (84%), and within 50 miles by water (99%).
This report illustrates the typical weather in Basseterre year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Basseterre.
For each station, the records are corrected for the elevation difference between that station and Basseterre according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Basseterre is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Basseterre and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.