The long rains that peak in April usually continue into early to mid-May, but overall it tends to be a lot dryer that the two months that preceded it. Wildlife viewing is usually excellent, and the scenery is lovely and green, though the wildebeest that amass in the west of the Ngorongoro Conservation Area usually start to head northwest and deeper into the Serengeti at some point before the start of June. That said, for those whose visit to Tanzania is all about the northern safari circuit, May is a pretty good choice, as it tends to be very uncrowded, many hotels and lodges offer discounted rates.