The weather is hard to predict year to year. As an example, in most of B.C. last June was an very wet month and if you rode up north most of your days would have been wet. In July, it switched over from spring weather to summer and became nice and sunny. Next year, who knows?
There's a comfort factor to riding in the wet but also a safety factor and an enjoyment factor. It's a pretty special part of the world and very scenic if clear-ish skies allow for looking around.
Take a look at the weather averages for the cities on the way up and try to target a time to maximize your chances of better weather. In general, July and August are the peak summer months and while they see the most traffic as that is summer holidays for the school kids, it is also the period that offers the best probability of decent to good weather. I'd say that June and September are also good shoulder months, with September ranking ahead of June for the better of the shoulder season. These are of course generalizations as you'll be cutting through a few thousand kms and a few temperature zones but offer a fair starting point. Happy planning.
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