The article says it had its busiest ever month in April but that cannot possibly be correct, busiest April probably, but it could not possibly have been busier than a typical July or August at the airport.
Well spotted, I thought it sounded odd! Wikipedia mentions 81,000 passengers using the airport in August 09 as the busiest month.
Interesting route numbers table on that page also.
wikipedia
Anna aero feature on the airport:
ireland-west-airport-knock-celebrates-25th-anniversary/