Fall Weather in Cayes Jacmel Haiti

Daily high temperatures are around 89°F, rarely falling below 85°F or exceeding 93°F.

Daily low temperatures are around 80°F, rarely falling below 76°F or exceeding 83°F.

For reference, on August 6, the hottest day of the year, temperatures in Cayes Jacmel typically range from 81°F to 91°F, while on January 26, the coldest day of the year, they range from 76°F to 86°F.

The figure below shows you a compact characterization of the hourly average fall 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.

Singapore (11,076 miles away) and Tucdao, Philippines (10,082 miles) are the far-away foreign places with temperatures most similar to Cayes Jacmel (view comparison).

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The fall in Cayes Jacmel experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 71% to 42%. The highest chance of overcast or mostly cloudy conditions is 75% on September 27.

The clearest day of the fall is November 30, with clear, mostly clear, or partly cloudy conditions 58% of the time.

For reference, on June 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on January 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cayes Jacmel, the chance of a wet day over the course of the fall is gradually decreasing, starting the season at 11% and ending it at 8%.

For reference, the year's highest daily chance of a wet day is 17% on May 21, and its lowest chance is 4% on February 11.

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 fall in Cayes Jacmel is decreasing, starting the season at 1.5 inches, when it rarely exceeds 3.4 inches, and ending the season at 0.7 inches, when it rarely exceeds 2.2 inches.

The highest average 31-day accumulation is 2.0 inches on October 5.

Over the course of the fall in Cayes Jacmel, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 21 minutes, implying an average daily decrease of 54 seconds, and weekly decrease of 6 minutes, 17 seconds.

The shortest day of the fall is November 30, with 11 hours, 7 minutes of daylight and the longest day is September 1, with 12 hours, 28 minutes of daylight.

The latest sunrise of the fall in Cayes Jacmel is 6:49 AM on November 2 and the earliest sunrise is 1 hour, 0 minutes earlier at 5:50 AM on November 3.

The latest sunset is 7:03 PM on September 1 and the earliest sunset is 1 hour, 52 minutes earlier at 5:11 PM on November 23.

Daylight saving time (DST) starts at 1:00 AM on November 3, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 6:14 AM and sets 13 hours, 14 minutes later, at 7:28 PM, while on December 21, the shortest day of the year, it rises at 6:16 AM and sets 11 hours, 2 minutes later, at 5:19 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 fall 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 Cayes Jacmel is rapidly decreasing during the fall, falling from 100% to 89% over the course of the season.

For reference, on August 9, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 13, the least muggy day of the year, there are muggy conditions 71% 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 Cayes Jacmel is essentially constant during the fall, remaining within 0.7 miles per hour of 7.0 miles per hour throughout.

For reference, on July 1, the windiest day of the year, the daily average wind speed is 9.9 miles per hour, while on October 22, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.

The lowest daily average wind speed during the fall is 6.3 miles per hour on October 22.

The hourly average wind direction in Cayes Jacmel throughout the fall is predominantly from the east, with a peak proportion of 74% on November 30.

Cayes Jacmel 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 Cayes Jacmel is essentially constant during the fall, remaining within 1°F of 84°F throughout.

The highest average surface water temperature during the fall is 85°F on September 18.

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 Cayes Jacmel 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 Cayes Jacmel are very rapidly increasing during the fall, increasing by 2,988°F, from 7,855°F to 10,843°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 Cayes Jacmel is essentially constant during the fall, remaining within 0.3 kWh of 4.9 kWh throughout.

The lowest average daily incident shortwave solar energy during the fall is 4.6 kWh on October 23.

For the purposes of this report, the geographical coordinates of Cayes Jacmel are 18.231 deg latitude, -72.394 deg longitude, and 39 ft elevation.

The topography within 2 miles of Cayes Jacmel contains very significant variations in elevation, with a maximum elevation change of 1,673 feet and an average elevation above sea level of 170 feet. Within 10 miles contains very significant variations in elevation (6,414 feet). Within 50 miles also contains extreme variations in elevation (8,898 feet).

The area within 2 miles of Cayes Jacmel is covered by water (48%), cropland (19%), trees (16%), and grassland (12%), within 10 miles by water (49%) and cropland (22%), and within 50 miles by water (59%) and cropland (17%).