Like Texas (hiked some there) Pa weather really depends on where you are. I live in what is call the Foothills of the Alleghenies, the difference in temps can be over 10° during the day, more at night, between the foothills and the tops of the mountains. North Central Pa is even more of a difference, and the temps can swing widely from one day to the next. The mountains really do make a difference when it comes to weather and temps.

I've done some hiking in Texas, mostly in the Guadalupe Mtns, very nice country. I was supposed to do some hiking/rafting/riding in Big Bend this year, but health got in the way...maybe next year?
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Life should not be a journey to the grave with the intent of arriving safely in a well preserved body, but to skid in broadside, thoroughly used up, worn out, and loudly proclaiming Wow! What a Ride!