Fall Weather in San Cristóbal ArgentinaDaily high temperatures decrease by 19°F, from 85°F to 67°F, rarely falling below 57°F or exceeding 94°F. Daily low temperatures decrease by 17°F, from 66°F to 49°F, rarely falling below 38°F or exceeding 73°F. For reference, on January 8, the hottest day of the year, temperatures in San Cristóbal typically range from 68°F to 89°F, while on July 18, the coldest day of the year, they range from 45°F to 65°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. Ash Shafā, Saudi Arabia (7,612 miles away) is the far-away foreign place with temperatures most similar to San Cristóbal (view comparison). CloudsThe fall in San Cristóbal experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 28% to 42%. The lowest chance of overcast or mostly cloudy conditions is 26% on March 24. The clearest day of the fall is March 24, with clear, mostly clear, or partly cloudy conditions 74% of the time. For reference, on June 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on March 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Cristóbal, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 32% and ending it at 12%. For reference, the year's highest daily chance of a wet day is 35% on February 6, and its lowest chance is 7% on July 30. 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 Cristóbal is very rapidly decreasing, starting the season at 5.3 inches, when it rarely exceeds 8.5 inches or falls below 2.4 inches, and ending the season at 1.2 inches, when it rarely exceeds 2.6 inches or falls below 0.1 inches. SunOver the course of the fall in San Cristóbal, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 23 minutes, implying an average daily decrease of 1 minute, 34 seconds, and weekly decrease of 10 minutes, 58 seconds. The shortest day of the fall is May 31, with 10 hours, 19 minutes of daylight and the longest day is March 1, with 12 hours, 42 minutes of daylight. The earliest sunrise of the fall in San Cristóbal is 6:56 AM on March 1 and the latest sunrise is 57 minutes later at 7:53 AM on May 31. The latest sunset is 7:37 PM on March 1 and the earliest sunset is 1 hour, 26 minutes earlier at 6:12 PM on May 31. Daylight saving time is not observed in San Cristóbal during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 6:00 AM and sets 14 hours, 6 minutes later, at 8:06 PM, while on June 20, the shortest day of the year, it rises at 8:01 AM and sets 10 hours, 11 minutes later, at 6:12 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 Cristóbal is very rapidly decreasing during the fall, falling from 58% to 8% over the course of the season. For reference, on February 7, the muggiest day of the year, there are muggy conditions 61% of the time, while on July 20, the least muggy day of the year, there are muggy conditions 1% 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 Cristóbal is essentially constant during the fall, remaining within 0.1 miles per hour of 6.8 miles per hour throughout. For reference, on September 12, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on April 25, the calmest day of the year, the daily average wind speed is 6.8 miles per hour. The lowest daily average wind speed during the fall is 6.8 miles per hour on May 2. The wind direction in San Cristóbal during the fall is predominantly out of the east from March 1 to May 20 and the north from May 20 to May 31. 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). The growing season in San Cristóbal typically lasts for 11 months (321 days), from around August 1 to around June 19, rarely starting after September 8, or ending before May 23. The fall in San Cristóbal is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 81% over the course of the season. 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 Cristóbal are very rapidly increasing during the fall, increasing by 1,469°F, from 4,295°F to 5,764°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 Cristóbal is very rapidly decreasing during the fall, falling by 3.0 kWh, from 6.2 kWh to 3.2 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of San Cristóbal are -30.311 deg latitude, -61.237 deg longitude, and 259 ft elevation. The topography within 2 miles of San Cristóbal is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of 249 feet. Within 10 miles is essentially flat (125 feet). Within 50 miles also contains only modest variations in elevation (285 feet). The area within 2 miles of San Cristóbal is covered by cropland (63%), grassland (13%), and trees (12%), within 10 miles by cropland (46%) and shrubs (18%), and within 50 miles by cropland (46%) and shrubs (23%). Data SourcesThis report illustrates the typical weather in San Cristóbal, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in San Cristóbal. For each station, the records are corrected for the elevation difference between that station and San Cristóbal according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The estimated value at San Cristóbal is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Cristóbal and a given station. The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of San Cristóbal and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. 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. |