Table 1.

Weather conditions in Cape Town and Pretoria; data from [16,17,18].

Parameter	Cape Town Latitude 35° S, Altitude 0–300 m		Pretoria Latitude 26° S, Altitude 1339 m
	Summer	Winter	Summer	Winter
Average hours of sunshine per day	11	5	10	8
Ultraviolet index	9–10	2–3	11+	4–6
Average temperature in °C, minimum/maximum	16/26	7/18	18/28	5/20