Spring Weather in Chillán ChileDaily high temperatures increase by 18°F, from 62°F to 79°F, rarely falling below 55°F or exceeding 87°F. Daily low temperatures increase by 8°F, from 41°F to 49°F, rarely falling below 31°F or exceeding 55°F. For reference, on January 23, the hottest day of the year, temperatures in Chillán typically range from 53°F to 87°F, while on July 25, the coldest day of the year, they range from 39°F to 58°F. The figure below shows you a compact characterization of the hourly average spring 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. Healdsburg, United States (6,128 miles away) and Naracoorte, Australia (6,944 miles) are the far-away foreign places with temperatures most similar to Chillán (view comparison). CloudsThe spring in Chillán experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 50% to 22%. The clearest day of the spring is November 30, with clear, mostly clear, or partly cloudy conditions 78% of the time. For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on January 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Chillán, the chance of a wet day over the course of the spring is very rapidly decreasing, starting the season at 26% and ending it at 8%. For reference, the year's highest daily chance of a wet day is 41% on June 22, and its lowest chance is 5% on January 15. 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 spring in Chillán is very rapidly decreasing, starting the season at 3.1 inches, when it rarely exceeds 5.8 inches or falls below 0.9 inches, and ending the season at 0.8 inches, when it rarely exceeds 2.1 inches. SunOver the course of the spring in Chillán, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 3 hours, 7 minutes, implying an average daily increase of 2 minutes, 5 seconds, and weekly increase of 14 minutes, 33 seconds. The shortest day of the spring is September 1, with 11 hours, 21 minutes of daylight and the longest day is November 30, with 14 hours, 28 minutes of daylight. The latest sunrise of the spring in Chillán is 7:57 AM on September 8 and the earliest sunrise is 1 hour, 34 minutes earlier at 6:23 AM on November 30. The earliest sunset is 6:28 PM on September 1 and the latest sunset is 2 hours, 23 minutes later at 8:51 PM on November 30. Daylight saving time (DST) ends at 1:00 AM on September 8, 2024, shifting sunrise and sunset to be an hour earlier. For reference, on December 21, the longest day of the year, the Sun rises at 6:26 AM and sets 14 hours, 40 minutes later, at 9:06 PM, while on June 20, the shortest day of the year, it rises at 8:00 AM and sets 9 hours, 39 minutes later, at 5:39 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 spring 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 Chillán is essentially constant during the spring, remaining around 0% throughout. For reference, on February 18, the muggiest day of the year, there are muggy conditions 0% of the time, while on April 8, 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 Chillán is essentially constant during the spring, remaining within 0.4 miles per hour of 5.1 miles per hour throughout. For reference, on January 18, the windiest day of the year, the daily average wind speed is 5.9 miles per hour, while on October 5, the calmest day of the year, the daily average wind speed is 4.7 miles per hour. The lowest daily average wind speed during the spring is 4.7 miles per hour on October 8. The hourly average wind direction in Chillán throughout the spring is predominantly from the south, with a peak proportion of 55% on November 24. 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 Chillán typically lasts for 7.7 months (234 days), from around September 21 to around May 13, rarely starting before August 26 or after November 8, and rarely ending before April 13 or after June 11. The spring in Chillán is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly increasing from 18% to 96% 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 Chillán are rapidly increasing during the spring, increasing by 711°F, from 140°F to 851°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 Chillán is very rapidly increasing during the spring, rising by 4.7 kWh, from 3.9 kWh to 8.6 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of Chillán are -36.607 deg latitude, -72.103 deg longitude, and 433 ft elevation. The topography within 2 miles of Chillán contains only modest variations in elevation, with a maximum elevation change of 157 feet and an average elevation above sea level of 411 feet. Within 10 miles contains only modest variations in elevation (620 feet). Within 50 miles contains significant variations in elevation (10,459 feet). The area within 2 miles of Chillán is covered by shrubs (56%), trees (17%), and grassland (16%), within 10 miles by cropland (32%) and trees (30%), and within 50 miles by trees (47%) and shrubs (18%). Data SourcesThis report illustrates the typical weather in Chillán, 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, Carriel Sur International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Chillán. At a distance of 88 kilometers from Chillán, 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 Chillán 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. |