The monthly average came in very close to 61F, beating out the 60.5 in 1940 (see below). In precipitation, the monthly total was .12 inches tying the amount observed in 1992.
It was a real nail-biter yesterday around dinner time as a line of showers went through...fortunately, there was only a trace of rain...which doesn't count.
Why such a nice month? Because there was a persistent ridge of high pressure over and to the north of Washington.
To illustrate this, here is the difference from normal of the heights at the 500 hPa pressure level (around 18,000 ft). The yellow blob north and east of western Washington shows a center of above-normal heights... known as a ridge of high pressure. Such a ridge of high pressure is associated with warm, sinking air.
The weekend should be pretty normal-- middle to high 60s, considerable clouds, and a few sprinkles, through mid-day Sunday, followed by an increasing shower chance later in the day.
from Cliff Mass Weather and Climate Blog https://ift.tt/2HaRO9B
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