Fall Weather in San Juan Chamelco Guatemala

Daily high temperatures decrease by 5°F, from 78°F to 73°F, rarely falling below 67°F or exceeding 82°F. The highest daily average high temperature is 78°F on September 1.

Daily low temperatures decrease by 5°F, from 62°F to 56°F, rarely falling below 52°F or exceeding 64°F. The highest daily average low temperature is 62°F on September 17.

For reference, on May 3, the hottest day of the year, temperatures in San Juan Chamelco typically range from 61°F to 83°F, while on January 18, the coldest day of the year, they range from 54°F to 73°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.

Iringa, Tanzania (8,765 miles away) is the far-away foreign place with temperatures most similar to San Juan Chamelco (view comparison).

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The fall in San Juan Chamelco experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 88% to 45%. The highest chance of overcast or mostly cloudy conditions is 90% on September 17.

The clearest day of the fall is November 30, with clear, mostly clear, or partly cloudy conditions 55% of the time.

For reference, on June 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on January 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Juan Chamelco, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 57% and ending it at 14%.

For reference, the year's highest daily chance of a wet day is 62% on September 14, and its lowest chance is 5% on February 17.

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 San Juan Chamelco is very rapidly decreasing, starting the season at 6.6 inches, when it rarely exceeds 12.1 inches or falls below 1.2 inches, and ending the season at 1.3 inches, when it rarely exceeds 2.9 inches or falls below 0.1 inches.

The highest average 31-day accumulation is 6.9 inches on September 16.

Over the course of the fall in San Juan Chamelco, 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, 7 minutes, implying an average daily decrease of 45 seconds, and weekly decrease of 5 minutes, 15 seconds.

The shortest day of the fall is November 30, with 11 hours, 17 minutes of daylight and the longest day is September 1, with 12 hours, 24 minutes of daylight.

The earliest sunrise of the fall in San Juan Chamelco is 5:48 AM on September 1 and the latest sunrise is 23 minutes later at 6:11 AM on November 30.

The latest sunset is 6:13 PM on September 1 and the earliest sunset is 45 minutes earlier at 5:27 PM on November 21.

Daylight saving time is not observed in San Juan Chamelco during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:31 AM and sets 13 hours, 3 minutes later, at 6:34 PM, while on December 21, the shortest day of the year, it rises at 6:23 AM and sets 11 hours, 13 minutes later, at 5:36 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 San Juan Chamelco is rapidly decreasing during the fall, falling from 11% to 1% over the course of the season.

The highest chance of a muggy day during the fall is 14% on September 14.

For reference, on June 11, the muggiest day of the year, there are muggy conditions 16% of the time, while on January 26, the least muggy day of the year, there are muggy conditions 0% 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 San Juan Chamelco is gradually increasing during the fall, increasing from 3.5 miles per hour to 4.3 miles per hour over the course of the season.

For reference, on March 18, the windiest day of the year, the daily average wind speed is 4.6 miles per hour, while on September 14, the calmest day of the year, the daily average wind speed is 3.3 miles per hour.

The highest daily average wind speed during the fall is 4.4 miles per hour on November 21. The lowest daily average wind speed during the fall is 3.3 miles per hour on September 15.

The wind direction in San Juan Chamelco during the fall is predominantly out of the east from September 1 to October 2 and the north from October 2 to November 30.

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 San Juan Chamelco 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 San Juan Chamelco are very rapidly increasing during the fall, increasing by 1,465°F, from 4,169°F to 5,634°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 San Juan Chamelco is essentially constant during the fall, remaining within 0.2 kWh of 4.9 kWh throughout.

The lowest average daily incident shortwave solar energy during the fall is 4.7 kWh on September 18.

For the purposes of this report, the geographical coordinates of San Juan Chamelco are 15.433 deg latitude, -90.333 deg longitude, and 4,619 ft elevation.

The topography within 2 miles of San Juan Chamelco contains significant variations in elevation, with a maximum elevation change of 686 feet and an average elevation above sea level of 4,587 feet. Within 10 miles contains significant variations in elevation (5,932 feet). Within 50 miles also contains extreme variations in elevation (9,839 feet).

The area within 2 miles of San Juan Chamelco is covered by trees (63%) and cropland (32%), within 10 miles by trees (56%) and cropland (42%), and within 50 miles by trees (53%) and cropland (32%).