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Average Weather in Gustavia St. Barthélemy

The climate in Gustavia is hot, oppressive, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 75°F to 88°F and is rarely below 72°F or above 90°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in GustaviaJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Gustavia, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Gustavia begins around November 18 and lasts for 5.4 months, ending around April 29. On January 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 82% of the time, and overcast or mostly cloudy 18% of the time.

The cloudier part of the year begins around April 29 and lasts for 6.6 months, ending around November 18. On May 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.

Cloud Cover Categories

Cloud Cover Categories in GustaviaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 1282%Jan 1282%May 3031%May 3031%Nov 1856%Nov 1856%Apr 2956%Apr 2956%clearpartly cloudyovercastmostly clearmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Gustavia varies throughout the year.

The wetter season lasts 6.8 months, from May 6 to December 1, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 24% on September 7.

The drier season lasts 5.2 months, from December 1 to May 6. The smallest chance of a wet day is 2% on January 16.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 24% on September 7.

Daily Chance of Precipitation

Daily Chance of Precipitation in GustaviawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Sep 724%Sep 724%Jan 162%Jan 162%Jan 16%Jan 16%May 614%May 614%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Gustavia experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.8 months, from April 8 to January 1, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around October 21, with an average total accumulation of 2.5 inches.

The rainless period of the year lasts for 3.2 months, from January 1 to April 8. The least rain falls around January 28, with an average total accumulation of 0.2 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Gustavia varies over the course of the year. In 2017, the shortest day is December 21, with 11 hours, 4 minutes of daylight; the longest day is June 21, with 13 hours, 12 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:35 AM on June 4, and the latest sunrise is 1 hour, 11 minutes later at 6:45 AM on January 19. The earliest sunset is at 5:33 PM on November 23, and the latest sunset is 1 hour, 17 minutes later at 6:51 PM on July 6.

Daylight saving time (DST) is not observed in Gustavia during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in GustaviaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 45:35 AMJun 45:35 AM6:51 PMJul 66:51 PMJul 6Nov 235:33 PMNov 235:33 PM6:45 AMJan 196:45 AMJan 19daynightnightnightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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.

Gustavia experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 11 months, from March 26 to February 18, during which time the comfort level is muggy, oppressive, or miserable at least 89% of the time. The muggiest day of the year is October 2, with muggy conditions 100% of the time.

The least muggy day of the year is March 6, with muggy conditions 85% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in GustaviamuggymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Mar 685%Mar 685%100%Oct 2100%Oct 2oppressiveoppressivehumidhumidmuggymuggymiserablemiserable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Gustavia experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 2.9 months, from May 30 to August 28, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is July 12, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 9.1 months, from August 28 to May 30. The calmest day of the year is October 9, with an average hourly wind speed of 6.7 miles per hour.

Average Wind Speed

Average Wind Speed in GustaviawindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphJul 129.1 mphJul 129.1 mphOct 96.7 mphOct 96.7 mphMay 307.8 mphMay 307.8 mphAug 287.8 mphAug 287.8 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Gustavia is from the east throughout the year.

Wind Direction

Wind Direction in GustaviaJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%eastsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Gustavia 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.5 months, from July 30 to November 14, with an average temperature above 83°F. The day of the year with the warmest water is September 27, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.1 months, from January 10 to April 13, with an average temperature below 80°F. The day of the year with the coolest water is February 24, with an average temperature of 79°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.0 months, from March 8 to May 7, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is April 14, with an average of 7.2 kWh.

The darker period of the year lasts for 3.7 months, from September 16 to January 8, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest day of the year is October 31, with an average of 4.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in GustaviabrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhApr 147.2 kWhApr 147.2 kWhOct 314.6 kWhOct 314.6 kWhMar 86.6 kWhMar 86.6 kWhSep 165.2 kWhSep 165.2 kWhJan 85.1 kWhJan 85.1 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Gustavia are 17.896 deg latitude, -62.850 deg longitude, and 0 ft elevation.

The topography within 2 miles of Gustavia contains significant variations in elevation, with a maximum elevation change of 650 feet and an average elevation above sea level of 81 feet. Within 10 miles contains significant variations in elevation (915 feet). Within 50 miles contains very significant variations in elevation (3,451 feet).

The area within 2 miles of Gustavia is covered by water (77%), within 10 miles by water (99%), and within 50 miles by water (98%).

Data Sources

This report illustrates the typical weather in Gustavia, 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 Gustavia.

For each station, the records are corrected for the elevation difference between that station and Gustavia 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 Gustavia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Gustavia and a given station.

The stations contributing to this reconstruction are: Princess Juliana International Airport (90%, 33 kilometers, northwest) and V. C. Bird International Airport (10%, 140 kilometers, southeast).

Other Data

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.