Fall Weather in San Andrés ColombiaDaily high temperatures are around 85°F, rarely falling below 82°F or exceeding 88°F. The highest daily average high temperature is 86°F on September 18. Daily low temperatures are around 80°F, rarely falling below 77°F or exceeding 82°F. For reference, on September 11, the hottest day of the year, temperatures in San Andrés typically range from 80°F to 86°F, while on February 18, the coldest day of the year, they range from 78°F to 83°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. Vailoatai, American Samoa (6,379 miles away); Casuguran, Philippines (9,943 miles); and Pandan, Philippines (10,089 miles) are the far-away foreign places with temperatures most similar to San Andrés (view comparison). CloudsThe fall in San Andrés experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 87% to 59%. The highest chance of overcast or mostly cloudy conditions is 88% on September 16. The clearest day of the fall is November 30, with clear, mostly clear, or partly cloudy conditions 41% of the time. For reference, on June 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 91%, while on January 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Andrés, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 56% and ending it at 41%. For reference, the year's highest daily chance of a wet day is 68% on October 7, and its lowest chance is 0% on March 21. RainfallTo 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 Andrés is essentially constant, remaining about 5.7 inches throughout, and rarely exceeding 12.3 inches or falling below 1.0 inches. The highest average 31-day accumulation is 7.2 inches on October 22. SunOver the course of the fall in San Andrés, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 54 minutes, implying an average daily decrease of 36 seconds, and weekly decrease of 4 minutes, 14 seconds. The shortest day of the fall is November 30, with 11 hours, 27 minutes of daylight and the longest day is September 1, with 12 hours, 21 minutes of daylight. The earliest sunrise of the fall in San Andrés is 6:15 AM on September 24 and the latest sunrise is 16 minutes later at 6:32 AM on November 30. The latest sunset is 6:36 PM on September 1 and the earliest sunset is 39 minutes earlier at 5:57 PM on November 18. Daylight saving time is not observed in San Andrés during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 6:02 AM and sets 12 hours, 52 minutes later, at 6:54 PM, while on December 21, the shortest day of the year, it rises at 6:43 AM and sets 11 hours, 23 minutes later, at 6:06 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. MoonThe 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. HumidityWe 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 Andrés is essentially constant during the fall, remaining around 100% throughout. For reference, on April 4, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 26, the least muggy day of the year, there are muggy conditions 100% of the time. WindThis 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 Andrés is very rapidly increasing during the fall, increasing from 12.0 miles per hour to 16.8 miles per hour over the course of the season. For reference, on January 3, the windiest day of the year, the daily average wind speed is 18.2 miles per hour, while on October 1, the calmest day of the year, the daily average wind speed is 10.5 miles per hour. The lowest daily average wind speed during the fall is 10.5 miles per hour on October 1. The hourly average wind direction in San Andrés throughout the fall is predominantly from the east, with a peak proportion of 84% on September 1. Water TemperatureSan Andrés 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 San Andrés is essentially constant during the fall, remaining within 1°F of 83°F throughout. The highest average surface water temperature during the fall is 84°F on September 25. Growing SeasonDefinitions 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 Andrés 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 Andrés are very rapidly increasing during the fall, increasing by 2,887°F, from 7,718°F to 10,606°F, over the course of the season. Solar EnergyThis 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 Andrés is essentially constant during the fall, remaining within 0.4 kWh of 4.2 kWh throughout. The lowest average daily incident shortwave solar energy during the fall is 3.9 kWh on September 29. TopographyFor the purposes of this report, the geographical coordinates of San Andrés are 12.585 deg latitude, -81.701 deg longitude, and 10 ft elevation. The topography within 2 miles of San Andrés contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 13 feet. Within 10 miles also contains only modest variations in elevation (348 feet). Within 50 miles also contains only modest variations in elevation (328 feet). The area within 2 miles of San Andrés is covered by water (82%), within 10 miles by water (98%), and within 50 miles by water (100%). Data SourcesThis report illustrates the typical weather in San Andrés, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere is only a single weather station, Gustavo Rojas Pinilla International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Andrés. At a distance of 1 kilometer from San Andrés, 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 San Andrés 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 DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. DisclaimerThe information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. Please review our full terms contained on our Terms of Service page. |