The climate in Zimbabwe is sub-tropical with a summer season of about eight months (October to April), with hot, sunny days the norm. Summer daytime temperatures range around 86ºF (30ºC) in the main centres, though the low-lying areas such as the Zambezi Valley, Kariba, and Victoria Falls tend to be hotter, and there is always a possibility of an afternoon thunderstorm.The Zimbabwean winter climate is pleasant, with warm, dry days from June to August (though temperatures do drop more extremely at night) and the average temperature is around 68ºF (20ºC). Rain occurs mostly between November and March in Zimbabwe, though rainfall patterns do vary according to region.The best game viewing time is during the months of August, September and October: this is the dry season when animals congregate at the waterholes. The best time of the year for white water rafting on the Zambezi is September, October, and November.