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Average Weather in Road Town British Virgin Islands

The climate in Road Town is hot, oppressive, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 74°F to 89°F and is rarely below 72°F or above 92°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 Road Town12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothot
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 Road Town, 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 Road Town begins around November 16 and lasts for 5.5 months, ending around April 30. On January 11, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.

The cloudier part of the year begins around April 30 and lasts for 6.5 months, ending around November 16. On May 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 72% of the time, and clear, mostly clear, or partly cloudy 28% of the time.

Cloud Cover

Cloud Cover in Road Townclearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMay 3072%May 3072%Jan 1117%Jan 1117%Nov 1645%Nov 1645%Apr 3045%Apr 3045%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
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 Road Town varies throughout the year.

The wetter season lasts 7.0 months, from May 2 to December 3, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 29% on September 21.

The drier season lasts 5.0 months, from December 3 to May 2. The smallest chance of a wet day is 5% on March 25.

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 29% on September 21.

Daily Chance of Precipitation

Daily Chance of Precipitation in Road Townwetwetdrydrydrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecSep 2129%Sep 2129%Mar 255%Mar 255%Jan 110%Jan 110%May 218%May 218%rainrain
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. Road Town experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.4 months, from March 30 to January 10, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 21, with an average total accumulation of 2.8 inches.

The rainless period of the year lasts for 2.6 months, from January 10 to March 30. The least rain falls around March 13, with and average total accumulation of 0.3 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 Road Town varies over the course of the year. In 2017, the shortest day is December 21, with 11 hours, 2 minutes of daylight; the longest day is June 21, with 13 hours, 14 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 5:41 AM on June 5, and the latest sunrise is 1 hour, 12 minutes later at 6:53 AM on January 18. The earliest sunset is at 5:40 PM on November 24, and the latest sunset is 1 hour, 19 minutes later at 6:59 PM on July 6.

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

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in Road Town2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 55:41 AMJun 55:41 AM6:59 PMJul 66:59 PMJul 6Nov 245:40 PMNov 245:40 PM6:53 AMJan 186:53 AMJan 18daydaynightnightnightnight
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.

Road Town experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 9.7 months, from March 29 to January 20, during which time the comfort level is muggy, oppressive, or miserable at least 80% of the time. The muggiest day of the year is August 3, with muggy conditions 100% of the time.

The least muggy day of the year is March 2, with muggy conditions 72% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in Road Townmuggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMar 272%Mar 272%100%Aug 3100%Aug 3Mar 2980%Mar 2980%Jan 2080%Jan 2080%miserablemiserableoppressiveoppressivemuggymuggycomfortablecomfortable
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 Road Town experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 2.9 months, from June 2 to August 31, with average wind speeds of more than 7.5 miles per hour. The windiest day of the year is July 14, with an average hourly wind speed of 8.7 miles per hour.

The calmer time of year lasts for 9.1 months, from August 31 to June 2. The calmest day of the year is October 10, with an average hourly wind speed of 6.4 miles per hour.

Average Wind Speed

Average Wind Speed in Road Townwindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphJanFebMarAprMayJunJulAugSepOctNovDecJul 148.7 mphJul 148.7 mphOct 106.4 mphOct 106.4 mphJun 27.5 mphJun 27.5 mphAug 317.6 mphAug 317.6 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 Road Town is from the east throughout the year.

Wind Direction

Wind Direction in Road Town0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecsouthsoutheasteastnorthnorthwestwest
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

Road Town 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 3.4 months, from July 30 to November 12, with an average temperature above 83°F. The day of the year with the warmest water is September 23, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.3 months, from January 6 to April 14, with an average temperature below 80°F. The day of the year with the coolest water is February 27, with an average temperature of 79°F.

Average Water Temperature

Average Water Temperature in Road Townwarmwarmcoolcool76°F77°F78°F79°F80°F81°F82°F83°F84°F85°F86°FJanFebMarAprMayJunJulAugSepOctNovDecSep 2384°FSep 2384°F79°FFeb 2779°FFeb 27Jul 3083°FJul 3083°FNov 1283°FNov 1283°FJan 680°FJan 680°FApr 1480°FApr 1480°F
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 1.9 months, from March 7 to May 4, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is April 15, with an average of 7.1 kWh.

The darker period of the year lasts for 3.9 months, from September 13 to January 9, with an average daily incident shortwave energy per square meter below 5.1 kWh. The darkest day of the year is October 30, with an average of 4.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Road Townbrightbrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJanFebMarAprMayJunJulAugSepOctNovDecApr 157.1 kWhApr 157.1 kWhOct 304.6 kWhOct 304.6 kWhMar 76.6 kWhMar 76.6 kWhSep 135.1 kWhSep 135.1 kWhJan 95.1 kWhJan 95.1 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 Road Town are 18.427 deg latitude, -64.621 deg longitude, and 33 ft elevation.

The topography within 2 miles of Road Town contains very significant variations in elevation, with a maximum elevation change of 1,476 feet and an average elevation above sea level of 421 feet. Within 10 miles also contains very significant variations in elevation (1,742 feet). Within 50 miles also contains very significant variations in elevation (1,781 feet).

The area within 2 miles of Road Town is covered by trees (41%), water (28%), and grassland (25%), within 10 miles by water (87%), and within 50 miles by water (98%).

Data Sources

This report illustrates the typical weather in Road Town, 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 Road Town.

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

The stations contributing to this reconstruction are: Cyril E. King Airport (90%, 39 kilometers, west) and Princess Juliana International Airport (10%, 165 kilometers, east).

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.