I have been watching WeatherCat 2.2x memory usage in my Activity Monitor. On a new start of WeatherCat, it takes up less than 200 MB for a short while and then progresses to between 200 and 275 MB. At the end of the month/first of the next month, WC memory climbs to over 300 MB. When I use the Data Viewer/Editor tool, even if I am not editing, just looking, usage climbs to well over 500 MB.
I draw no conclusions; I am just sharing what I observed.