Ha!! Seasonal changes are a HUGE stressor for me as well but it is the Winter, not the Summer. I have plans to move South within the next few years... my daughter actually is already down there for college.
I actually have been diagnosed with SAD... I do get more tempted to consume when confined to the indoors. (Hopefully, you have A/C.)
Look on the bright side, if it is 70 degrees for one minute during any time during any given day, you have had at least one minute more of good weather than we have on a Winter Day when the high temperature doesn't even reach 0 degrees. ;-)
I am sure I will be right there with you about complaining about Summer weather if I move to a state like AZ or FL. I've been there during the Summer and know it is not fun... best of luck to you.