December Weather in San Francisco del Chañar ArgentinaDaily high temperatures increase by 2°F, from 82°F to 84°F, rarely falling below 73°F or exceeding 93°F. Daily low temperatures increase by 3°F, from 59°F to 62°F, rarely falling below 52°F or exceeding 69°F. For reference, on January 1, the hottest day of the year, temperatures in San Francisco del Chañar typically range from 62°F to 84°F, while on July 19, the coldest day of the year, they range from 38°F to 61°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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. Cessnock, Australia (7,540 miles away) is the far-away foreign place with temperatures most similar to San Francisco del Chañar (view comparison). CloudsThe month of December in San Francisco del Chañar experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 25% throughout the month. The clearest day of the month is December 9, with clear, mostly clear, or partly cloudy conditions 77% of the time. For reference, on May 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 38%, while on March 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Francisco del Chañar, the chance of a wet day over the course of December is gradually increasing, starting the month at 38% and ending it at 41%. For reference, the year's highest daily chance of a wet day is 41% on December 31, and its lowest chance is 3% on August 9. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during December in San Francisco del Chañar is gradually increasing, starting the month at 4.0 inches, when it rarely exceeds 6.3 inches or falls below 2.2 inches, and ending the month at 4.4 inches, when it rarely exceeds 7.6 inches or falls below 2.1 inches. SunOver the course of December in San Francisco del Chañar, the length of the day is essentially constant. The shortest day of the month is December 1, with 13 hours, 55 minutes of daylight and the longest day is December 21, with 14 hours, 4 minutes of daylight. The earliest sunrise of the month in San Francisco del Chañar is 6:07 AM on December 3 and the latest sunrise is 11 minutes later at 6:18 AM on December 31. The earliest sunset is 8:02 PM on December 1 and the latest sunset is 17 minutes later at 8:19 PM on December 31. Daylight saving time is not observed in San Francisco del Chañar during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 4 minutes later, at 8:16 PM, while on June 20, the shortest day of the year, it rises at 8:10 AM and sets 10 hours, 14 minutes later, at 6:24 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 December 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 Francisco del Chañar is rapidly increasing during December, rising from 14% to 29% over the course of the month. For reference, on January 24, the muggiest day of the year, there are muggy conditions 34% of the time, while on July 17, the least muggy day of the year, there are muggy conditions 0% 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 Francisco del Chañar is gradually decreasing during December, decreasing from 9.2 miles per hour to 8.6 miles per hour over the course of the month. For reference, on October 8, the windiest day of the year, the daily average wind speed is 10.1 miles per hour, while on June 13, the calmest day of the year, the daily average wind speed is 7.1 miles per hour. The hourly average wind direction in San Francisco del Chañar throughout December is predominantly from the east, with a peak proportion of 62% on December 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 Francisco del Chañar typically lasts for 8.8 months (266 days), from around August 28 to around May 22, rarely starting before July 24 or after September 22, and rarely ending before April 24 or after July 1. The month of December in San Francisco del Chañar is reliably fully within the growing 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 Francisco del Chañar are rapidly increasing during December, increasing by 661°F, from 1,627°F to 2,288°F, over the course of the month. 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 Francisco del Chañar is essentially constant during December, remaining within 0.1 kWh of 7.7 kWh throughout. The highest average daily incident shortwave solar energy during December is 7.8 kWh on December 10. TopographyFor the purposes of this report, the geographical coordinates of San Francisco del Chañar are -29.790 deg latitude, -63.939 deg longitude, and 2,234 ft elevation. The topography within 2 miles of San Francisco del Chañar contains only modest variations in elevation, with a maximum elevation change of 197 feet and an average elevation above sea level of 2,285 feet. Within 10 miles contains only modest variations in elevation (1,060 feet). Within 50 miles contains very significant variations in elevation (3,556 feet). The area within 2 miles of San Francisco del Chañar is covered by shrubs (33%), cropland (32%), trees (19%), and grassland (15%), within 10 miles by shrubs (53%) and cropland (21%), and within 50 miles by shrubs (43%) and trees (25%). Data SourcesThis report illustrates the typical weather in San Francisco del Chañar, 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, Villa De Maria Del Rio Seco, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Francisco del Chañar. At a distance of 28 kilometers from San Francisco del Chañar, 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 Francisco del Chañar 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. 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