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→How is the functionality used
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The normal way to retrieve a specific value is by using [[Full list of Webtags#Table of Recent History tag names available|Recent History Webtag names]] and specifying how much time you want before the now using the [[Webtags/Parameters|parameters]].
You'll get the nearest value if you ask for a time for which there is currently no exact match, and the [[Full list of Webtags#Timestamp tag|Timestamp tag]] tells you that nearest time.
There are a number of internal calculations, such as calculating [[Average temperature]], [[Heat/cold degree days and Chill hours]], which use the recent history data stored in the Recent History Database for CumulusMX. These data are also used for the standard [[MX_Administrative_Interface#Charts|charts]] and the JSON data for the charts on the standard website and many other websites. See: [[:Category:JSON_Files#Uploading_data_to_a_web_server_outside_MX:|Uploading data to a webserver outside CumulusMX ]] .
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