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Average Weather in Saint George's Grenada

In Saint George's, the wet season is hot, windy, and mostly cloudy; the dry season is warm, extremely windy, and partly cloudy; and it is oppressive year round. Over the course of the year, the temperature typically varies from 75°F to 87°F and is rarely below 72°F or above 88°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 Saint George's12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecwarmhot
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 Saint George's, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Saint George's begins around December 6 and lasts for 3.9 months, ending around April 2. On January 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 47% of the time, and overcast or mostly cloudy 53% of the time.

The cloudier part of the year begins around April 2 and lasts for 8.1 months, ending around December 6. On September 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.

Cloud Cover

Cloud Cover in Saint George'sclearercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecSep 2773%Sep 2773%Jan 1253%Jan 1253%Dec 663%Dec 663%Apr 263%Apr 263%overcastmostly cloudypartly cloudymostly clearclear
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 Saint George's varies very significantly throughout the year.

The wetter season lasts 6.4 months, from May 25 to December 7, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 60% on August 13.

The drier season lasts 5.6 months, from December 7 to May 25. The smallest chance of a wet day is 4% on March 1.

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 60% on August 13.

Daily Chance of Precipitation

Daily Chance of Precipitation in Saint George'swetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 1360%Aug 1360%Mar 14%Mar 14%Jan 119%Jan 119%May 2533%May 2533%Dec 733%Dec 733%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. Saint George's experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from March 29 to February 2, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 10, with an average total accumulation of 4.8 inches.

The rainless period of the year lasts for 1.9 months, from February 2 to March 29. The least rain falls around March 5, 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 Saint George's does not vary substantially over the course of the year, staying within 50 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 25 minutes of daylight; the longest day is June 21, with 12 hours, 50 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 May 31, and the latest sunrise is 51 minutes later at 6:32 AM on January 25. The earliest sunset is at 5:38 PM on November 18, and the latest sunset is 57 minutes later at 6:36 PM on July 9.

Daylight saving time (DST) is not observed in Saint George's during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in Saint George's12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecMay 315:41 AMMay 315:41 AM6:36 PMJul 96:36 PMJul 9Nov 185:38 PMNov 185:38 PM6:32 AMJan 256:32 AMJan 25daynightnightnightnight
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.

The perceived humidity level in Saint George's, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 100% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Saint George's0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMar 1100%Mar 1100%100%Aug 23100%Aug 23miserablemiserableoppressiveoppressivemuggymuggy
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 Saint George's experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.1 months, from November 23 to July 25, with average wind speeds of more than 8.3 miles per hour. The windiest day of the year is February 10, with an average hourly wind speed of 9.7 miles per hour.

The calmer time of year lasts for 3.9 months, from July 25 to November 23. The calmest day of the year is September 14, with an average hourly wind speed of 7.0 miles per hour.

Average Wind Speed

Average Wind Speed in Saint George'swindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphJanFebMarAprMayJunJulAugSepOctNovDecFeb 109.7 mphFeb 109.7 mphSep 147.0 mphSep 147.0 mphNov 238.3 mphNov 238.3 mphJul 258.3 mphJul 258.3 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 Saint George's is from the east throughout the year.

Wind Direction

Wind Direction in Saint George's0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDeceastsouthnorth
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

Saint George's 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 2.8 months, from August 13 to November 7, with an average temperature above 83°F. The day of the year with the warmest water is September 12, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.5 months, from January 5 to April 20, with an average temperature below 81°F. The day of the year with the coolest water is February 26, with an average temperature of 80°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 2.7 months, from February 19 to May 10, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is April 1, with an average of 7.0 kWh.

The darker period of the year lasts for 2.5 months, from September 13 to November 29, with an average daily incident shortwave energy per square meter below 5.0 kWh. The darkest day of the year is October 12, with an average of 4.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Saint George'sbrightdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJanFebMarAprMayJunJulAugSepOctNovDecApr 17.0 kWhApr 17.0 kWhOct 124.5 kWhOct 124.5 kWhFeb 196.5 kWhFeb 196.5 kWhMay 106.5 kWhMay 106.5 kWhNov 295.0 kWhNov 295.0 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 Saint George's are 12.056 deg latitude, -61.748 deg longitude, and 161 ft elevation.

The topography within 2 miles of Saint George's contains very significant variations in elevation, with a maximum elevation change of 1,155 feet and an average elevation above sea level of 255 feet. Within 10 miles contains very significant variations in elevation (2,710 feet). Within 50 miles also contains large variations in elevation (2,717 feet).

The area within 2 miles of Saint George's is covered by water (43%), cropland (23%), trees (21%), and grassland (10%), within 10 miles by water (75%) and trees (11%), and within 50 miles by water (99%).

Data Sources

This report illustrates the typical weather in Saint George's, 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 is only a single weather station, Maurice Bishop International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Saint George's.

At a distance of 7 kilometers from Saint George's, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Saint George's according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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.