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We're part of the REI Co-op family,
where a life outdoors is a life well lived.
I came to an important realization today. The South Africa grade scale maps exactly on to the Celsius temperature scale. Furthermore, you can express both values in terms of clothing:
0: Big puffy. Only fun if you're mountaineering.
12-17: you can wear a light jacket
19-23: pleasantly moderate; long pants and sleeves ok
24-30: Definitely t-shirts, shorts, and knee pads
30+: shirt off for power!
Next week I'll find out if this works as well in practice as it does in theory!