From June to the end of September, it doesn’t rain in northwest Washington State.
Its clear, warm, and its one of the most beautiful places on the planet.
Then you wake up one late September morning and it starts raining. And raining. Then it rains some more. This area gets an annual average of 4 feet of rain. You start wondering where all that water could be going, and if you’re going to need an ark.
But this is the trade off for June through September.. 
In Wyoming, we are lucky to get a foot all year. In the summer through fall, we frequently get less than an inch, although this year we a little rain regularly into early August, so we are green compared to normal and some of our reservoirs, that are normally bone dry by July, still have water in them. Four feet annual rainfall sounds wonderful until I think about what happens with our elevation changes when we get a big rain.
When I lived in Florida, if you got an inch of rain, there was a little less than an inch of water everywhere because the land was flat. It also drained fast since the ground was mostly sand. In Wyoming, when we get an inch of rain, we get damaging runoff and lowlands can have more than a foot of water. There is one low spot on the interstate, that runs under 2 overpasses (one for cars and one for trains). There is no place for runoff to go. When we get a big rain, it is unpassable. I've learned to avoid the spot if we get any significant amount of rain (> 1/2 in).
