Don't know about the weather but...

...do not miss the Botanical Garden and the Insectarium...the Insectarium is de rigeur for kids....mine have been there twice; once when they were very young and later when they were in their early teens and they were delighted to get back and see it again. What's not to love about Montreal? The old part of the city is great and the Museum of Archaeology is one of the coolest museums that I have ever seen (and I've seen a lot of 'em).

I have two kids who want Poutine served in the Chicago McDonalds.

If there's a top ten list of cities in North America, Montreal is on it...go: shop, eat, enjoy.

Best

AA