Where is summer?

A weather search crisply informs us that in South Africa winter starts on 1 May and ends on 31 July. Just like that; the seasons are supposed to fit neatly into our season boxes. People assume that South Africa is warm, in fact the biggest economic boost we got from the World Cup was all the tourists buying jackets and beanies to survive the matches.
As a tropical child I take exception to winter. In Lusaka the minimum temperature is 15C, which is far more suitable for humans than Johannesburg's regular forays into the minus zone.My garden looks like a death zone from the black frost and the labradors have given up trying to excavate their way to Australia because of the permafrost layer.I can't for the life of me understand why people actually venture outside at night in winter. Most places look like a Michelin Man convention at night.
Of course real summer doesn't get here until December, this is why I have a firm rule about not swimming in an outdoor swimming pool before Christmas day.
I'd like to make a request to the relevant authorities to update their search information: Winter in Johannesburg lasts from March to November. The other months are (in order) warm, decent, decent, cool.