Is there anyway to easily filter form fills for all email programs for the month of June?

You can do this in Marketo by using a "Lead Performance" report and then just set the smart list filter to "Filled Out Form" and specify your form (or any). Then add a constraint for "Date of Activity" and select time frame (between), "from 1 June to 31st June." .The downside to this is it will only give you the total number, you won't see who filled it out. This is a feature not available in the Marketo reports/subscriptions. if you need to know who filled it out you have to create the smartlist in lead database section.