The scorching summer temperatures have Jersey City residents scrambling to their nearest municipal pool. But if you live near the Pavonia Avenue pool, you’re out of luck. No kids splashing or thrashing, no ker-plash of a titanic cannonball. The pool, which serves Journal Square and West Side residents, has been closed while the other city pools — Lafayette and Pershing Field — opened June 24. Councilmen Frank Gilmore and Richard Boggiano pressured Recreation and Youth Development Director Lucinda McLaughlin at Monday’s caucus meeting for answers about the shuttered Pavonia pool. “The swimmin…