September Weather at Osoyoos Automatic Weather Reporting System CanadaDaily high temperatures decrease by 12°F, from 81°F to 69°F, rarely falling below 60°F or exceeding 90°F. Daily low temperatures decrease by 8°F, from 53°F to 44°F, rarely falling below 35°F or exceeding 60°F. For reference, on August 1, the hottest day of the year, temperatures at Osoyoos Automatic Weather Reporting System typically range from 59°F to 88°F, while on December 29, the coldest day of the year, they range from 23°F to 32°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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. Sofia, Bulgaria (5,715 miles away) is the far-away foreign place with temperatures most similar to Osoyoos Automatic Weather Reporting System (view comparison). CloudsThe month of September at Osoyoos Automatic Weather Reporting System experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 41%. The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 67% of the time. For reference, on January 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Osoyoos Automatic Weather Reporting System, the chance of a wet day over the course of September is essentially constant, remaining around 9% throughout. For reference, the year's highest daily chance of a wet day is 24% on May 29, and its lowest chance is 8% on August 12. 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 September at Osoyoos Automatic Weather Reporting System is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.2 inches. The lowest average 31-day accumulation is 0.4 inches on September 17. SunOver the course of September at Osoyoos Automatic Weather Reporting System, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 43 minutes, implying an average daily decrease of 3 minutes, 34 seconds, and weekly decrease of 24 minutes, 56 seconds. The shortest day of the month is September 30, with 11 hours, 40 minutes of daylight and the longest day is September 1, with 13 hours, 24 minutes of daylight. The earliest sunrise of the month at Osoyoos Automatic Weather Reporting System is 6:15 AM on September 1 and the latest sunrise is 42 minutes later at 6:56 AM on September 30. The latest sunset is 7:38 PM on September 1 and the earliest sunset is 1 hour, 2 minutes earlier at 6:37 PM on September 30. Daylight saving time is observed at Osoyoos Automatic Weather Reporting System during 2024, but it neither starts nor ends during September, so the entire month is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 4:53 AM and sets 16 hours, 13 minutes later, at 9:05 PM, while on December 21, the shortest day of the year, it rises at 7:49 AM and sets 8 hours, 13 minutes later, at 4:02 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 September 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 at Osoyoos Automatic Weather Reporting System is essentially constant during September, remaining around 0% throughout. For reference, on August 2, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, 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 at Osoyoos Automatic Weather Reporting System is essentially constant during September, remaining within 0.1 miles per hour of 3.9 miles per hour throughout. For reference, on April 17, the windiest day of the year, the daily average wind speed is 4.4 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 3.7 miles per hour. The wind direction at Osoyoos Automatic Weather Reporting System during September is predominantly out of the north from September 1 to September 27 and the south from September 27 to September 30. 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 at Osoyoos Automatic Weather Reporting System typically lasts for 5.6 months (171 days), from around April 24 to around October 11, rarely starting before April 5 or after May 12, and rarely ending before September 22 or after October 29. The month of September at Osoyoos Automatic Weather Reporting System is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 79% over the course of the month. 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 at Osoyoos Automatic Weather Reporting System are increasing during September, increasing by 326°F, from 2,209°F to 2,534°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 at Osoyoos Automatic Weather Reporting System is rapidly decreasing during September, falling by 1.7 kWh, from 5.5 kWh to 3.8 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Osoyoos Automatic Weather Reporting System are 49.033 deg latitude, -119.433 deg longitude, and 1,033 ft elevation. The topography within 2 miles of Osoyoos Automatic Weather Reporting System contains extreme variations in elevation, with a maximum elevation change of 3,304 feet and an average elevation above sea level of 1,614 feet. Within 10 miles also contains extreme variations in elevation (4,692 feet). Within 50 miles also contains extreme variations in elevation (7,782 feet). The area within 2 miles of Osoyoos Automatic Weather Reporting System is covered by sparse vegetation (37%), water (28%), bare soil (14%), and shrubs (11%), within 10 miles by shrubs (33%) and trees (26%), and within 50 miles by trees (53%) and shrubs (23%). Data SourcesThis report illustrates the typical weather at Osoyoos Automatic Weather Reporting System, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointOsoyoos Automatic Weather Reporting System has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required. In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations. The stations on which we may fall back include but are not limited to Penticton Regional Airport; Omak Airport; Summerland Automatic Weather Reporting System; Kelowna International Airport; Princeton Automatic Weather Reporting System; Vernon, B. C.; Salmon Arm Automatic Weather Reporting System; and West Kootenay Regional Airport. 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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