A: The weekend.
It's a gorgeous, sunny day here in the Puget Sound. Of course it is. It's Monday. Well, virtual Monday, yesterday being a holiday and all.
At first I thought it was my imagination, this idea that it somehow always rains on weekends, sunshine being doled out only on the days when I'm trapped in my hermetically sealed office.
I told myself to stop being such a Debbie Downer, that there aren't really rain gods up there, high-fiving each other and mocking me, down in my soggy, grey existence, every weekend.
Surely I only thought it rained more on the weekends because that's when I notice the rain. Right?
"Suck it up and drive on, Cowbell," I admonished myself, "Quit being such a whining babypants, it's just your imagination."
Except it wasn't.
There actually is scientific evidence explaining the rainy weekend phenomenon:
The fine particulate matter produced by car exhaust and other human sources of pollution form cloud condensation nuclei, leads to the production of clouds and increases the likelihood of rain.
As commuters and commercial traffic cause pollution to build up over the course of the week, the likelihood of rain increases: it peaks by Saturday, after five days of weekday pollution has been built up.
In heavily populated areas that are near the coast, such as the United States' Eastern Seaboard, the effect can be dramatic: there is a 22% higher chance of rain on Saturdays than on Mondays.
Further research turned up a story on KOMO-4 news where our own Steve Pool, of Double Doppler fame, analyzed several years of rainfall records specifically to investigate the weekend rain phenomenon. The findings? Yes, Virginia, it does rain more on Saturday and Sunday than any other day, with Sunday edging out Saturday. Friday -- of course -- is the driest day of the week, which I can see nicely through my 20" wide office window.