Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
The only way I can think of that you could do it would be to use the fact that the temperature trend value is in realtime.txt and also in the web tag <#temptrend>, so you could capture it at regular intervals from one of those.
Ideally, you would do it with a script. For example, Kevin (TNET weather) wrote a PHP script which takes the realtime.txt file and appends it to a file to create a realtime.log.
OK I have a script that saves the date, hour and temperature trend to a txt file on the server. Can you put this information on the website as a graph in the graphs tab like the other data that is displayed? http://areecki.ihq.pl/pogoda/realtime-db.txt
I would like to have an additional chart here, eg instead of the temperature inside: http://areecki.ihq.pl/pogoda/trends.htm
There isn't a chart for this in Cumulus, so you will have to create your own. You can then put it in the Cumulus web page instead of the inside temperature chart. I'm sorry if you don't know how to do that, but you can't really expect me to put absolutely everything into Cumulus that everyone wants.
I understand. I will try to put another application that will draw me a chart and placing it on the page. In the future, you would think the temperature trend graph. Cheers and thank you.