I've seen it in August in 2002 and 1990. In 1990 Environment Canada didn't call it "snow", but the police report on the multi car pileup on Deerfoot did. I specifically remember 1990 because I was living in Winnipeg still, and had to come to Calgary for an emergency. I left Winnipeg at midnight and it was 30 degrees at midnight. I said to myself "How much colder could it possibly be in Calgary?"
I found out.
And 2002 I was the last one to leave Calgary for our anual camping trip in BC. I got there and it was 25 degrees and nobody believed me that I left snow in Calgary.
As for July; I don't recall the exact year but it was fairly recently; in the last 5 years I think.
It's never been "build a snowman" type of snow, but snow never the less.
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