I read the Top question post on weather and understand in May the weather is still cool. I was browsing through some older post today and there was quite a few DE suggesting it may not be a good idea about coming in May (with the implication the weather is still cold) - better in June.
At this point I plan to come around after the 18th May and I'm beginning to worry after reading those posts it may not be such a good idea. With Toronto its okay as spring appears to arrive earlier than in QC and Montreal. Would it really be that cold that its not comfortable walking outside all day or am I just being paranoid at this stage?