Between Jan 1st and Dec 31st 2025 there were 636 hours with precipitation in Vienna, out of 365 days x 24 hours = 7% risk of precipitation during a one-hour bike trip, or, in other words, a 93% probability of rain-free cycling during a one-hour bike trip.
As a comparison the probability of rain-free cycling during 2025 vs the past years:
The hourly precipitation per week for 2025 as measured by the Austrian Meteorological Institute for Vienna (most recent on top):