Winnipeg sports a continental climate which means that the summers are warm and the winters are cold. The tourist season goes on from April to September, when the fall is beginning to set in. The schools is Canada are out of the holidays from July to August which is when both the crowds and the rates are sky high.
If you're traveling on a budget, travel in the spring or fall. Rates are comparatively low and most of the attractions are open. Come winter, the temperatures drop in the minus and if you’re not used to the winters, you could have a tough time acclimating.