Climate and clothes
The namibian winter (May to September) is characterised by extreme differences between daytime and night-time temperatures. Temperatures may exceed 25 degrees centigrade by day and yet fall below zero at night.
Sun and humidity
The cloudless skies and low humidity (20-30%) so ideal for astronomy are also highly conducive to sunburn, dehydration and the shivers. Sun-cream, lip balm, T-shirts and shorts should be snuggling up against the woolly hat, sweatshirts and padded jacket in your luggage. None of this need worry the European astronomer - just be prepared to dress as you would for winter at home.