I live in the Seattle area and I don't think I even own an umbrella. Even working outside (recess duty, etc.) for about 1.5 hours every day, I don't use an umbrella. I mainly sail to Alaska, where it also rains a lot, and don't use an umbrella. I have good, waterproof rain jackets with hoods, and wear a ball cap under the hood to keep the rain off my glasses and keep the hood from drooping over my eyes.
Umbrellas are a hazard in crowded ports, and they don't work well in windy places, and especially don't work on moving ships. I've seen people try and it's hilarious!