Summer Weather in São João da Boa Vista BrazilDaily high temperatures are around 84°F, rarely falling below 76°F or exceeding 91°F. The highest daily average high temperature is 85°F on February 14. Daily low temperatures are around 66°F, rarely falling below 60°F or exceeding 70°F. The highest daily average low temperature is 67°F on January 21. For reference, on February 14, the hottest day of the year, temperatures in São João da Boa Vista typically range from 67°F to 85°F, while on July 20, the coldest day of the year, they range from 49°F to 76°F. The figure below shows you a compact characterization of the hourly average summer 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. Nkowakowa, South Africa (4,846 miles away) is the far-away foreign place with temperatures most similar to São João da Boa Vista (view comparison). CloudsThe summer in São João da Boa Vista experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 71% throughout the season. The highest chance of overcast or mostly cloudy conditions is 76% on January 16. The clearest day of the summer is December 1, with clear, mostly clear, or partly cloudy conditions 34% of the time. For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 27, 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 São João da Boa Vista, the chance of a wet day over the course of the summer is essentially constant, remaining around 65% throughout. For reference, the year's highest daily chance of a wet day is 71% on January 13, and its lowest chance is 8% on August 1. 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 summer in São João da Boa Vista is decreasing, starting the season at 7.4 inches, when it rarely exceeds 10.7 inches or falls below 4.3 inches, and ending the season at 6.6 inches, when it rarely exceeds 9.9 inches or falls below 2.8 inches. The highest average 31-day accumulation is 9.3 inches on January 4. SunOver the course of the summer in São João da Boa Vista, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 51 minutes, implying an average daily decrease of 34 seconds, and weekly decrease of 3 minutes, 59 seconds. The shortest day of the summer is February 28, with 12 hours, 32 minutes of daylight and the longest day is December 20, with 13 hours, 29 minutes of daylight. The earliest sunrise of the summer in São João da Boa Vista is 5:15 AM on December 1 and the latest sunrise is 48 minutes later at 6:03 AM on February 28. The latest sunset is 6:56 PM on January 14 and the earliest sunset is 21 minutes earlier at 6:35 PM on February 28. Daylight saving time is not observed in São João da Boa Vista during 2024. For reference, on December 21, the longest day of the year, the Sun rises at 5:21 AM and sets 13 hours, 29 minutes later, at 6:49 PM, while on June 20, the shortest day of the year, it rises at 6:45 AM and sets 10 hours, 47 minutes later, at 5:32 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 summer 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 São João da Boa Vista is rapidly increasing during the summer, rising from 58% to 75% over the course of the season. The highest chance of a muggy day during the summer is 79% on January 23. For reference, on January 14, the muggiest day of the year, there are muggy conditions 79% of the time, while on July 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 São João da Boa Vista is decreasing during the summer, decreasing from 6.5 miles per hour to 5.5 miles per hour over the course of the season. For reference, on September 12, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on March 9, the calmest day of the year, the daily average wind speed is 5.4 miles per hour. The wind direction in São João da Boa Vista during the summer is predominantly out of the east from December 1 to December 14 and from February 4 to February 28 and the north from December 14 to February 4. 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 São João da Boa Vista 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 São João da Boa Vista are very rapidly increasing during the summer, increasing by 2,124°F, from 2,761°F to 4,885°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 São João da Boa Vista is gradually decreasing during the summer, falling by 0.6 kWh, from 6.3 kWh to 5.7 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of São João da Boa Vista are -21.969 deg latitude, -46.798 deg longitude, and 2,539 ft elevation. The topography within 2 miles of São João da Boa Vista contains only modest variations in elevation, with a maximum elevation change of 384 feet and an average elevation above sea level of 2,520 feet. Within 10 miles contains only modest variations in elevation (3,274 feet). Within 50 miles contains large variations in elevation (4,147 feet). The area within 2 miles of São João da Boa Vista is covered by shrubs (46%), cropland (24%), grassland (16%), and trees (15%), within 10 miles by cropland (36%) and trees (30%), and within 50 miles by cropland (38%) and trees (28%). Data SourcesThis report illustrates the typical weather in São João da Boa Vista, 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, Pirassununga, in our network suitable to be used as a proxy for the historical temperature and dew point records of São João da Boa Vista. At a distance of 55 kilometers from São João da Boa Vista, 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 São João da Boa Vista 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. |