The Good Temperature For Clivia
The clivia's habitate is South Africa, they grow very well in semi-tropical forests where the average temperature is about 10C ~ 22C. So keeping a similar temperature is very good for clivia's growth. I think the plant will not be dormant until the temperature is below 5C. When the temperature drops down to 5~ 10C, the plant's upgrowth will be restrained. So, keeping the temperature above 10C in winter will be advisable. At the same time, in summer you should better keep surroundings area ventilated for Chinese types and keeping the temperature under 30C will be better, do not put them in the direct sunlight.