Pretty much the entire East coast and much of the midwest is hot & humid in the summer (I've lived in the Northeast, Southeast, Middle Atlantic, and northern midwest). The advantage of not being down south is that it tends to cool off elsewhere overnight. That's something I miss about CA--no matter how hot it gets during the day, it almost always cools off to the 60s at night. My favorite sleeping temperature is low 60s, so that worked for me.I'm a little warm at night these days in my Harlem tenement, but my daughter lives right across the street with windows on 3 sides, and her place is much more comfortable. (Alas, I can't afford something as big as her place--plus they bought close to the trough in NYC prices. I'm so happy for them!) In looking around for my next NY apartment, I give good-doobie points for windows on 2 sides.I heart NY, but climate-wise, I kinda long for the Rockies or Southwest. But if I were there, I'd miss city stuff. Another plus for Manhattan--I've been very healthy here, much healthier than I've been for years. One minor sinus infection in 5 months that I was able to take care of with herbal medicine (grapefruit seed extract, oreganol, and sambucol). In 9 years in SC, I never had a 5-month period without multiple ear infections, sinus infections, and usually a bout of bronchitis or pneumonia. And my husband never had allergies till we moved to SC.Anyway, looks like for the near term anyhow, NYC plus RVing elsewhere. The Adirondacks are magnificent in summer. And Jan-Mar in the southern southwest sounds good, too. I've only been there in spring & summer so far.