You have to accept that really inclement weather means that you have to make compromises. On my iPhone 5, I'd use an Otterbox Defender when canoeing or fishing or hiking. I could still take pictures which was my primary use for the phone since I had almost no connectivity.
I used an Armpocket for running, where it's only uses were to play musing and record the run with Runkeeper. It is only water resistant, and I basically had to take it out of the pocket to start/stop the run. The plastic covering in the Armpocket made using the phone very difficult.
With my iPhone 6S, I have an i-Blason case with holster. The case alone barely slips into the Plantronics arm band that came with my Backbeat Fit headphones. It doesn't even pretend to allow you to access the phone while it's in the band. So, I practice removing it as I finish a run to stop timing.