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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.

Climate Summary

warmhothotwarmJanFebMarAprMayJunJulAugSepOctNovDec47%47%27%27%overcastclearprecipitation: 4.8 inprecipitation: 4.8 in0.3 in0.3 inmuggy: 100%muggy: 100%100%100%beach/pool score: 7.1beach/pool score: 7.14.44.4
Click on each chart for more information.

Based on the beach/pool score, the best time of year to visit Saint George's for hot-weather activities is from mid December to early April.

Temperature

The temperature in Saint George's varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

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'sJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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 7 and lasts for 3.8 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 8.2 months, ending around December 7. 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 Categories

Cloud Cover Categories in Saint George'sclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 1247%Jan 1247%Sep 2727%Sep 2727%Dec 737%Dec 737%Apr 238%Apr 238%mostly clearclearovercastpartly cloudymostly 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 Saint George's varies very significantly throughout the year.

The wetter season lasts 6.5 months, from May 25 to December 8, with a greater than 32% 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 5.5 months, from December 8 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'swetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 1360%Aug 1360%Mar 14%Mar 14%Jan 119%Jan 119%May 2532%May 2532%Dec 832%Dec 832%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 1.8 months, from February 2 to March 29. The least rain falls around March 5, with an 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

Hours of Daylight and Twilight in Saint George'sJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2012 hr, 50 minJun 2112 hr, 50 minJun 2112 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 25 minDec 2111 hr, 25 minDec 21nightnightday
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'sJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMay 315:41 AMMay 315:41 AM6:36 PMJul 96:36 PMJul 9Nov 185:38 PMNov 185:38 PM6:32 AMJan 256:32 AMJan 25daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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'sJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 27100%Feb 27100%100%Aug 23100%Aug 23oppressiveoppressivemuggymuggymiserablemiserable
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 significant seasonal variation over the course of the year.

The windier part of the year lasts for 8.0 months, from November 24 to July 24, with average wind speeds of more than 15.4 miles per hour. The windiest day of the year is February 10, with an average hourly wind speed of 17.9 miles per hour.

The calmer time of year lasts for 4.0 months, from July 24 to November 24. The calmest day of the year is September 14, with an average hourly wind speed of 13.0 miles per hour.

Average Wind Speed

Average Wind Speed in Saint George'swindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mphFeb 1017.9 mphFeb 1017.9 mphSep 1413.0 mphSep 1413.0 mphNov 2415.4 mphNov 2415.4 mphJul 2415.4 mphJul 2415.4 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'sJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%east
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 6, 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 3.4 months, from January 6 to April 19, 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

Average Water Temperature in Saint George'swarmcoolJanFebMarAprMayJunJulAugSepOctNovDec78°F79°F80°F81°F82°F83°F84°F85°F86°F87°FSep 1284°FSep 1284°F80°FFeb 2680°FFeb 26Nov 683°FNov 683°FJan 681°FJan 681°FApr 1981°FApr 1981°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Saint George's throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Saint George's for general outdoor tourist activities is from early January to mid March, with a peak score in the first week of February.

Tourism Score

Tourism Score in Saint George'sbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.45.42.62.6 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Saint George's for hot-weather activities is from mid December to early April, with a peak score in the first week of February.

Beach/Pool Score

Beach/Pool Score in Saint George'sbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.17.14.44.45.55.55.25.2 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 Saint George's 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.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Saint George'sJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3warmhotcomfortable
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

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.

Growing Degree Days

Growing Degree Days in Saint George'sJanFebMarAprMayJunJulAugSepOctNovDec0°F2,000°F4,000°F6,000°F8,000°F10,000°FJan 490°FJan 490°FMar 51,800°FMar 51,800°FDec 3111,095°FDec 3111,095°F
The average growing degree days accumulated over the course of the year, 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 20 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'sbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhApr 17.0 kWhApr 17.0 kWhOct 124.5 kWhOct 124.5 kWhFeb 206.5 kWhFeb 206.5 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Saint George's.

For each station, the records are corrected for the elevation difference between that 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.

The estimated value at Saint George's is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint George's and a given station.

The stations contributing to this reconstruction are: Maurice Bishop International Airport (98%, 7 kilometers, southwest) and E. T. Joshua Airport (1.5%, 134 kilometers, northeast).

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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.