Mid and late April is peak summiting time for the literally hundreds (over 600 in 2017) who attempt to summit Mount Everest each year.
One thing I've always found interesting is that in 1922 the British Expedition to Everest got within half a kilometre of the summit. Two years later, George Mallory and Andrew Irvine are widely considered to have been within 250 m of the summit before tragedy struck. Yet, it took another 29 years for Sir Edmund Hillary and Tenzing Norgay to actually reach the summit and descend it safely. These statistics are a reminder that early breakthroughs can be impressive, stunning, even, but that building on initial progress can be tough, and is anything but immediate. Also, that the telling major breakthrough will often require time, patience, and good fortune.