I live in PA and while I can't comment on the specifics regarding this, I do know that many of the more popukus counties, especially Central and Eastern counties (Philly + York, Lancaster, Dauphin, Berks) have incredibly robust public education programs for kids with ASD.
My wife's 3 (yes, 3) youngest siblings all have autism and the youngest two (fraternal twins) are rather low functioning. The pubic school district has programs to accommodate them from K-HS (because it's not really the same scale) l. Through Medicaid, they have access to a wide range of supplementary programs like music, speech, and physical therapy, afterschool programs, summer camps, and other outlets specifically for ASD kids.
Moreover, I'd generally peg this region as accommodating - my wife's siblings have eloped numerous times and the police are familiar and respectful of them, helping them to get back home rather than detaining them and reprimaing my in-laws.
As for climate? It's all getting warmer regardless, but we have mild winters where generally it's hovering around 40, plus we're within 4 hours it less of DC, Baltimore, Pittsburgh, Philly, and NYC.