any area where the temp goes below 10 degrees Celsius should be a no go zone.
between 10 and 20 degrees is a cold zone and should only be visited to appreciate the warmer weather.
between 20 and 30 degrees is the perfect climate.
above 30 to 35 degrees is getting a little too warm.
above 35 and it's just too damned hot.
this is my take on the weather.