I'd think your's should reflect the colder zone but the demarcation line might not consider attitude as it's not mountainous there, just hilly. Is your location south of Meadville? That might factor in even though it's only 1.5 miles.
Zone lines fluctuate periodically, they're not set in stone. I've seen my locale go from 5b to 6a then back to 5b. I think the 6a is more correct and just go with that.
I sincerely believe the world is heating up and admire Al Gore.
