I did my ppl in April/May in San Diego / California and found it often uncomfortable hot in the cockpit.
At that time of year I flew around in Colorado, Wyoming and South Dakota this year weather was changing day to day, mostly to bad for the Rockies but you can keep out of them when based in denver.
In California I flew comfortable in winter having a nightrating, made trips to nevada.
There was unflyable days at all places.