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== Introduction ==
The files '''today.ini''' and '''yesterday.ini''' are used by Cumulus to store some counts, plus the Highs and Lows (and their timestamps) for key parameters as reached on each of the two days, for Cumulus 1 these are source for figures that appear on the main screen, for Cumulus 2 and 3(MX) they appear on the dashboard you can view. These files are normally located in the "Data" sub-folder of the path where your Cumulus.exe is installed. See [[FAQ#I_can.E2.80.99t_find_my_data_files.21| FAQ on location of data log files]] for where else to look.
=== Sections in yesterday.ini ===
See example at end of page. Each section is headed with something in square brackets [], then a number of parameters in format "attribute=value".
=== Sections in today.ini ===
The today.ini contains a number of sections, also headed with something in square brackets [], then a number of parameters in format "attribute=value". The [General] section stores current date and time. The [Wind} section stores the highest wind speed and highest gust, it holds the sum of wind speeds as wind run, and details for the dominant wind. The [Temp], or temperature, section stores the highest and lowest temperature, the sum of all temperatures from every minute (Total), and the number of Samples in that total, the Cumulative Chill Hours in the season, and the cumulative Heating and Cooling Degree Days for the current day. The [Pressure], [Humidity], [AppTemp], or apparent temperature, and [Dewpoint] sections just hold Highs and Lows. The [WindChill] section only holds lowest, the [HeatIndex] section only has highest, while the [Rain] section holds a lot of different parameters, including the Start count that derives most rain outputs, and the LastTip date-time.
Other sections always present are [ET], [Solar], and [FineOffset] whether these are updated depends on whether your weather station supplies the necessary information. All today.ini also have [NOAA] which will only be populated if you have set up NOAA reports, if you have it shows the file names of the latest monthly and yearly reports.
▲Other sections always present are [ET], [Solar], and [FineOffset] whether these are updated depends on whether your weather station supplies the necessary information. All today.ini also have [NOAA] which will only be populated if you have set up NOAA reports, if you have it shows the file names of the latest monthly and yearly reports.
=== Differences between Cumulus 1 and Cumulus MX ===
All the sections listed above are found in both versions of the software, and for all except [FineOffset] the contents are identically formatted. For the exception, Cumulus 1 uses real values with 5 digits before the decimal place and several after to represent time as fractional Days Since 30 Dec 1899; while Cumulus MX shows time in ISO 8601 format of "yyyy-MM-ddTHH:mm:ss" (using the net specifiers that MX uses). MX adds an additional section [Records] that contains entries like "Alltime=2020-03-06T06:42:13", in that case it indicates that various all-time records (lowest temperature, lowest apparent temperature, and greatest wind chill, in this example) were set on 6 March, but none have been broken since.
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