Used to hold the information that feeds the Webtags#Monthly for the 'thismonthT.htm' web template. These lows and highs and their timestamps can be seen by picking the Highs and Lows - This month screen from the View menu. Like today.ini the file has section headings with lists of properties (attribute = value). For more information on this file see in the Cumulus help file, in the section “Data log file format”.
The stored values can be corrected using the This month's records screen on the Edit menu. If you cannot find the file see this FAQ.