There was a large update of the Ontario Butterfly Atlas recently, and over 10,000 iNaturalist records were added. Records added to iNat before Oct 27, 2018 should be viewable in the Atlas. The Atlas currently has over 375,000 records but the data integration for 2018 will not be complete until (likely) early in the new year.

It seems a bit early but the iNat team has published their visualization of the site's activity for 2018, you can read the general article here. The national stats for Canada are also available, and if you scroll to the bottom of the page, you can generate a personalized summary of your 2018 observations. Enjoy!