The Toronto Entomologists' Association has recently updated the Ontario Butterfly Atlas with a batch of 2016 observations. The Atlas now includes over 800 observations from iNaturalist.
The default version of the Atlas provides detailed observation information based on a 10km x 10km grid for the entire province. More detailed information and analytics are available by toggling to the advanced atlas. You can sort the observations by county, many provincial and municipal parks, and even NABA count circles. Detailed phenograms that show the observed seasons for each species are also available in this view.