(GMT)07 NOV 2016 ERJO:
It rains a lot in Burma. The most popular tourist season is the dry season between November and February. It's horribly hot between March and May, so definitely avoid going then, unless you're visiting a hill station.
Temperatures can reach 40ºC in some places! Between July and September, the monsoon rains will try and drown the lands, making it extremely difficult to get around.