I agree with phishfearme, the streams are toasty and I'd wait till fall to target them, but then again you have to watch for spawning fish(both brookies or browns) at that time. I'm sure there's still some streams cool enough in NW PA this time of year, but your best bet for wild trout this time of year are spring creeks, more so once you get to the center of the state and farther. Most have pretty constant temps year round.
pm incoming.........not giving away any secrets though!!!!!!