Hey, want to learn something new? If the month has R in the name, it`s not a cold month. So May to August (от май до август) are the warm months, according to the calendar summer starts on June 22, but according to the Bulgarian traditions Гергьовден (St. George) is the beginning of the summer (this year it was May 6). 
May went crazy this year (usually March does that as she`s the only woman in the calendar) but that`s because they legalized bear divorces and now they need 2 wedding seasons. Kidding, May went crazy because we deserved it :)