I'm going to Banff National Park and Jasper NAtional Park in 2 days for a week and It's looking like it's going to rain the entire trip!?

How long does the rain last in the parks usually? Does it rain all day? Do people still go out hiking and stuff in the rain there? Are there an hikes or things to do regardless of weather?
Update: I'm going to Banff National Park and Jasper National Park in 2 days for a week and It's looking like it's going to rain the entire trip!
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