These data are raw and have not been assessed for the effects of changing station instrumentation and time of observation. This is particularly true outside the United States, where the number of records may be strongly influenced by station density from country to country and from year to year.

This tool provides simplistic counts of records to provide insight into recent climate behavior, but is not a definitive way to identify trends in the number of records set over time. In this way, it does not 'thread' the separate histories into one record for a city. This tool treats each of these histories as a different station. However, larger moves, such as a station moving from downtown to the city airport, generally result in the commissioning of a new station identifier. Small station moves, such as a move from one property to an adjacent property, may occur within a station history. This app for Windows 10 users is a simple and easy way to forecast weather conditions for the next 10 days. This is effectively a '30-year record of service' requirement, but allows for inclusion of some stations which routinely shut down during certain seasons. A station is defined as the complete daily weather records at a particular location, having a unique identifier in the GHCN-Daily dataset.įor a station to be considered for any parameter, it must have a minimum of 30 years of data with more than 182 days complete each year. The daily records summarized here are compiled from a subset of stations in the Global Historical Climatological Network. Some of this site's functionality requires Javascript to be enabled. Javascript has either been disabled or is not supported in your browser

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