Where'd the rain go? Seattle finishes up driest 5 month period on record
Seattle: Rain City USA.
Or is it?
These days, we might have to cede our title as the past several months have been anything but rainy... at least in the city.
Seattle has only amassed 2.04 inches of rain since May 1, making it the driest May-September on record, beating 2003's record of 2.94 inches. The average is 6.59 inches.
But even more impressive: It's the driest 5-month stretch of weather at any time of the year. The previous driest stretch was 2.06 inches set in June-October 1987 (although, naturally, 0.23" fell on Halloween.)
The stats were helped by May tying for the driest on record at 0.12 inches. The other months (June- 14th driest, July -- 6th, August --13th) also helped. Half the rain fell in September (1.04"). Seattle saw measurable rain on just 31 of the 153 days that period, and the average is about 40.
But it wasn't quite so dry everywhere. Everett, which had a few Convergence Zones to deal with, had 2.23" alone in September, and had more than double Seattle's 5 month total at 4.36".
The dry summer wasn't enough to keep Seattle from having a wetter than normal water year. Meteorologists also measure annual rainfall in Seattle from October to September (the "Water Year") to get a better gauge on the rainy fall and winter season, so it doesn’t reset in the middle on Jan. 1.
For the Oct. 1, 2017 to Sept. 30, 2018 period, Seattle netted 39.31" of rain, still above the annual average of 37.49 inches.
Yes, our previous fall, winter and spring were that wet!
October is kicking off the official start to the rainy season with...some light rain. Although long range forecasts continue to suggest the fall and winter will remain drier than normal.