Only uses COOPs, airport data, and weather balloon dataįorecasts are generated for 14 days in the future (Weather Underground only utilizes the first 10 days on the site)įorecasts are generated for 7 days into the future.Ī variety of inputs, including, but not limited to, ECMWF, GFS, and NAM Personal Weather Stations (quality-controlled to only include stations with accurate observations), COOPs, airport data, and weather balloon data. Temporal resolution (how often the forecast is updated) Spatial resolution (how many forecasts within a given area)Ĥkm grid (one forecast every 4km)-36% more forecasts than NWS In a step to create an unprecedented level of transparency to our forecasting, we publish the recent accuracy of our forecasts for every US location alongside the accuracy of the NDFD forecasts. Only our unrivaled amount of local neighborhood weather data can generate forecasts for your front door.įor US locations we give users the option to switch to view the forecasts generated from the National Weather Service’s National Digital Forecast Database (NDFD). BestForecast™ uses the most innovative forecast models available and cross-verifies their output with all of the localized data points. Our ever-expanding network of 250,000+ personal weather stations is the largest of its kind and provides us with a unique ability to provide the most local forecasts based on actual weather data points. Data and statistics for other stations, and associated charges, can be obtained by contacting our Customer Centre.All of our forecasts are generated from our proprietary forecasting system that leverages our vast amount of neighborhood weather data that we get from our community - we refer to the system as BestForecast™.
No allowances have been made for small site changes and developments in instrumentation. Data are indicated as provisional until the full network quality control has been carried out. Station data files are updated on a rolling monthly basis.
All other sunshine data have been recorded using a Campbell-Stokes recorder.
Sunshine data using a Kipp and Zonen sensor have been indicated by a "#" after the value. Estimated data (where available) have been indicated by "*" after the value. Missing data (more than two days missing in a month) have been indicated by "-". The monthly mean temperature is calculated from the average of the mean daily maximum and mean daily minimum temperature i.e. The series typically range from 50 to more than 100 years in length. Monthly data are available for a selection of long-running historic stations.
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