Jovial term for the climate you are living in or visiting. The words hot and cold can be interchanged with any word dictating temperature.
"I was hotweather sexed in the summer holidays", summers are usually warm/hot (unless you live on the north/south pole?), so it's 'to be hotweathersexed. In cold periods, such as winter, it would be coldweathersexed, or even freezingweathersexed (if it's below 0C/32F).