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 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
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
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
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 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
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
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
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
The predominant average hourly wind direction in Georgetown is from the east throughout the year.
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
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
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%).
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.
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.