Summer Weather in Fort Wellington Guyana

Daily high temperatures are around 85°F, rarely falling below 82°F or exceeding 89°F.

Daily low temperatures are around 77°F, rarely falling below 75°F or exceeding 79°F. The highest daily average low temperature is 77°F on August 23.

For reference, on September 12, the hottest day of the year, temperatures in Fort Wellington typically range from 77°F to 87°F, while on January 23, the coldest day of the year, they range from 76°F to 83°F.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Anse Boileau, Seychelles (7,845 miles away); Lazi, Philippines (11,374 miles); and Sola, Vanuatu (9,338 miles) are the far-away foreign places with temperatures most similar to Fort Wellington (view comparison).

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The summer in Fort Wellington experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 69% to 55%. The lowest chance of overcast or mostly cloudy conditions is 53% on August 15.

The clearest day of the summer is August 15, with clear, mostly clear, or partly cloudy conditions 47% of the time.

For reference, on April 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on August 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 47%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fort Wellington, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 79% and ending it at 35%.

For reference, the year's highest daily chance of a wet day is 81% on June 13, and its lowest chance is 22% on October 7.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Fort Wellington is very rapidly decreasing, starting the season at 9.6 inches, when it rarely exceeds 13.6 inches or falls below 6.0 inches, and ending the season at 2.9 inches, when it rarely exceeds 5.3 inches or falls below 1.0 inches.

The highest average 31-day accumulation is 9.6 inches on June 7.

Over the course of the summer in Fort Wellington, the length of the day is essentially constant. The shortest day of the summer is August 31, with 12 hours, 14 minutes of daylight and the longest day is June 21, with 12 hours, 30 minutes of daylight.

The earliest sunrise of the summer in Fort Wellington is 5:34 AM on June 1 and the latest sunrise is 11 minutes later at 5:45 AM on August 8.

The latest sunset is 6:10 PM on July 16 and the earliest sunset is 13 minutes earlier at 5:57 PM on August 31.

Daylight saving time is not observed in Fort Wellington during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:37 AM and sets 12 hours, 30 minutes later, at 6:07 PM, while on December 21, the shortest day of the year, it rises at 5:56 AM and sets 11 hours, 45 minutes later, at 5:41 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 chance that a given day will be muggy in Fort Wellington is essentially constant during the summer, remaining around 100% throughout.

For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 14, the least muggy day of the year, there are muggy conditions 100% of the time.

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 Fort Wellington is decreasing during the summer, decreasing from 9.6 miles per hour to 8.1 miles per hour over the course of the season.

For reference, on February 13, the windiest day of the year, the daily average wind speed is 11.7 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 7.7 miles per hour.

The lowest daily average wind speed during the summer is 7.7 miles per hour on August 7.

The hourly average wind direction in Fort Wellington throughout the summer is predominantly from the east, with a peak proportion of 96% on June 6.

Fort Wellington 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 surface water temperature in Fort Wellington is gradually increasing during the summer, rising by 2°F, from 81°F to 84°F, over the course of the 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 Fort Wellington 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.

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.

The average accumulated growing degree days in Fort Wellington are very rapidly increasing during the summer, increasing by 2,808°F, from 4,500°F to 7,308°F, over the course of the season.

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 in Fort Wellington is gradually increasing during the summer, rising by 0.9 kWh, from 4.8 kWh to 5.7 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the summer is 4.7 kWh on June 13.

For the purposes of this report, the geographical coordinates of Fort Wellington are 6.391 deg latitude, -57.604 deg longitude, and 7 ft elevation.

The topography within 2 miles of Fort Wellington is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 10 feet. Within 10 miles is essentially flat (112 feet). Within 50 miles also contains only modest variations in elevation (354 feet).

The area within 2 miles of Fort Wellington is covered by water (28%), shrubs (26%), cropland (19%), and trees (14%), within 10 miles by water (50%) and cropland (17%), and within 50 miles by water (61%) and trees (21%).