Some trees don't apply to the "Monthe ending in 'r' " rule. I have a white birch and it should be done in July. One spring I decided to prune mine and I got one branch cut and it started bleeding sap like a waterfall. My neighbour, who used to have a white birch, saw me and came rushing out to tell me that I'll just kill my tree. They were told that the middle of July is best, as spring and fall is when this trees sap really flows.
It doesn't make too much sense to me, but they are the ultimate green thumb peeps, with a perfectly kept yard, so I decided not to temp fate, and only prune my white birch in July.
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