The warmest months are July and August respectively. Therefore, although daytime temperatures may be hot, evenings generally are quite cool. Riding Mountain National Park at Wasagaming has an average growing season of 72 days. Considerable variability in growing seasons may occur in the park from one year to the next. Summer rainstorms are usually of short duration with relatively high storm precipitation levels.
Thunderstorms are common.
In winter, snowfalls tend to be of longer duration, greater frequency and lower storm precipitation totals than summer rainstorms. Rainfall may occur during winter months. Most rainfall occurs in June, July and August respectively. Most snowfall occurs in December and March. In southern Manitoba and southeastern Saskatchewan there are two prevailing wind directions, northwest and southeast.