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Average Weather in Georgetown Guyana

The climate in Georgetown is hot, oppressive, and overcast. Over the course of the year, the temperature typically varies from 74°F to 88°F and is rarely below 72°F or above 91°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 GeorgetownJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotwarmcomfortable
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 Georgetown, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Georgetown begins around June 21 and lasts for 3.5 months, ending around October 5. On August 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 44% of the time, and overcast or mostly cloudy 56% of the time.

The cloudier part of the year begins around October 5 and lasts for 8.5 months, ending around June 21. On April 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 74% of the time, and clear, mostly clear, or partly cloudy 26% of the time.

Cloud Cover Categories

Cloud Cover Categories in GeorgetownclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2644%Aug 2644%Apr 2726%Apr 2726%Jun 2135%Jun 2135%Oct 535%Oct 535%partly cloudymostly cloudyclearovercastmostly clear
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 Georgetown varies very significantly throughout the year.

The wetter season lasts 3.6 months, from May 1 to August 19, with a greater than 51% chance of a given day being a wet day. The chance of a wet day peaks at 78% on June 14.

The drier season lasts 8.4 months, from August 19 to May 1. The smallest chance of a wet day is 23% on March 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 78% on June 14.

Daily Chance of Precipitation

Daily Chance of Precipitation in GeorgetownwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 1478%Jun 1478%Mar 1623%Mar 1623%Jan 143%Jan 143%May 152%May 152%Aug 1951%Aug 1951%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. Georgetown experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Georgetown. The most rain falls during the 31 days centered around June 18, with an average total accumulation of 10.2 inches.

The least rain falls around October 11, with an average total accumulation of 2.3 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 Georgetown does not vary substantially over the course of the year, staying within 31 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 44 minutes of daylight; the longest day is June 21, with 12 hours, 31 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in GeorgetownJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2012 hr, 31 minJun 2112 hr, 31 minJun 2112 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 44 minDec 2111 hr, 44 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 5:35 AM on May 25, and the latest sunrise is 36 minutes later at 6:11 AM on February 1. The earliest sunset is at 5:31 PM on November 12, and the latest sunset is 41 minutes later at 6:13 PM on July 15.

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

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in GeorgetownJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMay 255:35 AMMay 255:35 AM6:13 PMJul 156:13 PMJul 15Nov 125:31 PMNov 125:31 PM6:11 AMFeb 16:11 AMFeb 1daynightnightnightnight
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 Georgetown, 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 GeorgetownJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 10100%Feb 10100%100%Jun 26100%Jun 26miserablemiserableoppressiveoppressivemuggymuggy
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 Georgetown experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from November 19 to June 3, with average wind speeds of more than 4.1 miles per hour. The windiest day of the year is February 13, with an average hourly wind speed of 4.8 miles per hour.

The calmer time of year lasts for 5.5 months, from June 3 to November 19. The calmest day of the year is August 7, with an average hourly wind speed of 3.4 miles per hour.

Average Wind Speed

Average Wind Speed in GeorgetownwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mph5.5 mphFeb 134.8 mphFeb 134.8 mphAug 73.4 mphAug 73.4 mphNov 194.1 mphNov 194.1 mphJun 34.1 mphJun 34.1 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 Georgetown is from the east throughout the year.

Wind Direction

Wind Direction in GeorgetownJanFebMarAprMayJunJulAugSepOctNovDec0%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

Georgetown 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 3.1 months, from July 30 to November 3, with an average temperature above 83°F. The day of the year with the warmest water is September 3, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.3 months, from December 27 to April 5, with an average temperature below 81°F. The day of the year with the coolest water is February 8, 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 2.3 months, from February 15 to April 25, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is March 27, with an average of 6.5 kWh.

The darker period of the year lasts for 1.8 months, from May 25 to July 20, with an average daily incident shortwave energy per square meter below 5.0 kWh. The darkest day of the year is June 14, with an average of 4.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in GeorgetownbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhMar 276.5 kWhMar 276.5 kWhJun 144.7 kWhJun 144.7 kWhFeb 156.1 kWhFeb 156.1 kWhJul 205.0 kWhJul 205.0 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 Georgetown are 6.804 deg latitude, -58.155 deg longitude, and 7 ft elevation.

The topography within 2 miles of Georgetown is essentially flat, with a maximum elevation change of 49 feet and an average elevation above sea level of 9 feet. Within 10 miles is also essentially flat (89 feet). Within 50 miles is essentially flat (1,020 feet).

The area within 2 miles of Georgetown is covered by water (46%), cropland (16%), shrubs (14%), and trees (14%), within 10 miles by water (56%) and cropland (19%), and within 50 miles by water (64%) and trees (24%).

Data Sources

This report illustrates the typical weather in Georgetown, 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, Cheddi Jagan International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Georgetown.

At a distance of 35 kilometers from Georgetown, 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 Georgetown 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.