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{{Template:Version badge Mx}}{{Version badge 1}}This Wiki page applies to both Cumulus flavours.
= Introduction =
This Wiki page describes one of the [[Category:Cumulus Files]][[:Category:Cumulus Files|files]] not included in any release download. This daily summary file (its formal title is shortened to "day" plus "file") uses a [[Category:MX_txt_Files]] [[:Category:MX_txt_Files|text extension]] and is created in [[Data folder|data sub-folder]] of your Cumulus installation when Cumulus needs to store its first line in this file.
The support forum may have links to content that is no longer on this Wiki page, so if the link you followed in the forum takes you to the start of this page, rather than to a particular section, the information you seek may now be on another page. this page is full of links that take you to content once on this page. The content that remains on this page is summarised by the table of contents that follows.{{TOCright}}
==How Cumulus Creates and Updates this file==
Cumulus reads values supplied by your weather station, converts them to the units you prefer, applies any calibration (multiplier and offset) you have set, and then sees if the resulting value implies [[:Category:Ini Files|any extreme records file]] needs to be updated (these hold derived values like totals, highest, and lowest). Two of those files are [[Today.ini#When_Cumulus_is_running|today.ini]] and [[yesterday.ini]] and values from those two files are exacted (see linked Wiki pages for how entries in those files map across to the daily summary file) at the end of a [[meteorological day]] to calculate the necessary [[#List_of_fields|fields]] for a new line to be added to this file.
As explained on the "meteorological day" page linked above, if your weather station stores weather data, then Cumulus on restarting can (optionally) read the '''historic data''' and catch-up by processing those past readings (as per description in start of previous paragraph), including activating any end of day actions (see [[Today.ini#Restart_and_Catch-up|today.ini]]), for the period since it was last running.
==Example of the file==
An extract of a few lines of
<pre>
07/08/11,17.7,342,13:24,12.9,05:47,24.1,14:53,1013.92,19:49,1016.43,09:36,0.0,00:00,0.0,18.4,19.1,6.3,14:06,48,12:45,89,05:36,3.30,9.0,24.1,14:53,24.6,15:48,13.3,05:47,0.0,00:00,12.9,05:47,14.6,15:52,10.7,11:33,11,1.6,1.7
</pre>
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