Oh that's so stupid. I'm climbing a mountain that has a tower on it, and right when I'm almost to the top it's starts raining and I slip. Now I'm just sitting here on a ledge waiting for it to stop raining.
hah i remember my first rain climb.
Wait it out and continue climbing up afterward. You might be greeted with something beautiful.
Pro tip: Pay attention to the weather bar on the HUD. Helps to know whether you should even attempt climbing a mountain if there would be rain coming