August Weather in Rolleston New ZealandDaily high temperatures increase by 3°F, from 52°F to 55°F, rarely falling below 46°F or exceeding 64°F. Daily low temperatures increase by 3°F, from 37°F to 40°F, rarely falling below 29°F or exceeding 47°F. For reference, on January 17, the hottest day of the year, temperatures in Rolleston typically range from 54°F to 72°F, while on June 30, the coldest day of the year, they range from 36°F to 51°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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. Tillamook, United States (7,296 miles away); La Ensenada, Chile (5,333 miles); and As Pontes de García Rodríguez, Spain (12,436 miles) are the far-away foreign places with temperatures most similar to Rolleston (view comparison). CloudsThe month of August in Rolleston experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month. The clearest day of the month is August 31, with clear, mostly clear, or partly cloudy conditions 55% of the time. For reference, on July 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on March 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rolleston, the chance of a wet day over the course of August is essentially constant, remaining around 30% throughout. For reference, the year's highest daily chance of a wet day is 35% on December 19, and its lowest chance is 24% on February 11. 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 August in Rolleston is essentially constant, remaining about 2.2 inches throughout, and rarely exceeding 4.4 inches or falling below 0.7 inches. SunOver the course of August in Rolleston, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 17 minutes, implying an average daily increase of 2 minutes, 34 seconds, and weekly increase of 17 minutes, 58 seconds. The shortest day of the month is August 1, with 9 hours, 47 minutes of daylight and the longest day is August 31, with 11 hours, 4 minutes of daylight. The latest sunrise of the month in Rolleston is 7:43 AM on August 1 and the earliest sunrise is 44 minutes earlier at 6:59 AM on August 31. The earliest sunset is 5:30 PM on August 1 and the latest sunset is 33 minutes later at 6:02 PM on August 31. Daylight saving time is observed in Rolleston during 2024, but it neither starts nor ends during August, so the entire month is in daylight saving time. For reference, on December 21, the longest day of the year, the Sun rises at 5:45 AM and sets 15 hours, 26 minutes later, at 9:11 PM, while on June 20, the shortest day of the year, it rises at 8:04 AM and sets 8 hours, 56 minutes later, at 5:00 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 August 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 Rolleston is essentially constant during August, remaining around 0% throughout. For reference, on January 27, the muggiest day of the year, there are muggy conditions 0% of the time, while on March 28, 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 Rolleston is essentially constant during August, remaining within 0.2 miles per hour of 9.3 miles per hour throughout. For reference, on December 25, the windiest day of the year, the daily average wind speed is 10.5 miles per hour, while on April 24, the calmest day of the year, the daily average wind speed is 8.6 miles per hour. The hourly average wind direction in Rolleston throughout August is predominantly from the west, with a peak proportion of 36% on August 3. Water TemperatureRolleston is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water. The average surface water temperature in Rolleston is essentially constant during August, remaining around 48°F throughout. The lowest average surface water temperature during August is 48°F on August 7. 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 Rolleston typically lasts for 7.4 months (221 days), from around September 27 to around May 7, rarely starting before August 28 or after November 5, and rarely ending before April 10 or after June 1. The month of August in Rolleston is very likely fully outside of the growing season, with the chance that a given day is in the growing season increasing from 0% to 13% 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 in Rolleston are essentially constant during August, remaining within 15°F of 31°F throughout. 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 Rolleston is increasing during August, rising by 1.2 kWh, from 2.0 kWh to 3.2 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Rolleston are -43.583 deg latitude, 172.383 deg longitude, and 197 ft elevation. The topography within 2 miles of Rolleston contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 197 feet. Within 10 miles contains only modest variations in elevation (558 feet). Within 50 miles contains significant variations in elevation (7,178 feet). The area within 2 miles of Rolleston is covered by grassland (45%), trees (23%), and cropland (23%), within 10 miles by grassland (33%) and cropland (32%), and within 50 miles by water (52%) and grassland (21%). Data SourcesThis report illustrates the typical weather in Rolleston, 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, Christchurch International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Rolleston. At a distance of 16 kilometers from Rolleston, 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 Rolleston 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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