I don't like riding in the rain, but I'm more likely to ride on rainy weekend days when I can time my rides to avoid the worst of it. Commuting in the rain sucks, IMHO, but I don't mind light rain that much. Unfortunately we get a lot of thunderstorms and soaking rains that I avoid riding in if possible. My commute is fairly long (31 miles round trip) and I get thoroughly soaked if the rain is steady or heavy. My route also takes me on several large roads with heavy traffic, and I feel much less safe in rainy conditions and find it difficult to see through my glasses.
The weather in NC has been much wetter than usual the past 3 years, which had made commuting much more challenging for me and my mileage has suffered. Last year, my commute miles were about 1,000 less than the previous year with drier weather. This year I made a concerted effort to top 5,000 miles commuting and fell short by 250 miles with a week to go -- and more rain in the forecast every day until New Years. I ended up riding on more rainy days than ever in 2015 and don't like it a bit more. In 2016, I'm going to ignore mileage goals and commute when the weather is suitable for riding. I'm tired of fighting the weather and stressing out over having to commute in heavy fog, steady downpours or thunderstorms.