Freddie Bisschoff delivered a very interesting talk on climates and made some graphs available to those of us who monitor our planting according to our climate. As we all know, there is no one-size-fits-all in South Africa due to our diverse conditions. Here is some information for those weather watchers!
I also found a very useful site that gives information on other towns, etc, if you want information closer to home.
Pretoria Climate Graph
Durban Climate Graph
Cape Town Climate Graph
Port Elizabeth Climate Graph