We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. We assume no responsibility for any decisions made on the basis of the content presented on this site. Weather data is prone to errors, outages, and other defects. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC. Time zones for airports and weather stations are provided by. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database. Land Use data comes from the Global Land Cover SHARE database, published by the Food and Agriculture Organization of the United Nations.Įlevation data comes from the Shuttle Radar Topography Mission (SRTM), published by NASA's Jet Propulsion Laboratory. 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.
In this case, the MERRA-2 weight is 30%, making the weight assigned to the weather station 70%.Īll 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.Īll other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis.
The weight assigned to the MERRA-2 value depends on the distance from Isale to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis, and both are corrected for elevation differences according to the International Standard Atmosphere.
There is only a single weather station, Kigoma Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Isale.Īt a distance of 172 kilometers from Isale, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. This report illustrates the typical weather in Isale, based on a statistical analysis of historical hourly weather reports and model reconstructions from Januto December 31, 2016.