The Coldest Day of the Year

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Today, January 3, is climatologically the COLDEST DAY OF THE YEAR in Seattle (actually the airport).  Here is the proof, based on the period 1948-2012.  The average maximum temperature drops to 43F and the minimum temperature to 33.  Then then warming begins!

Seattle Climatological Data

For Portland, the situation is similar, but not quite as crisp:  the lowest minimum temperatures (33F) are during the next few days, and the lowest maximum temperature (44) occurs through January 11th. 

Portland Airport

Similar story for eastern Washington...check out the Spokane Airport. The average max bottoms out at 32F during the next week or so, and the minimum hits its low on Saturday.

Spokane Airport

So we now at or close to the bottom for temperature, Thus, here in the Northwest our lowest temperatures are approximately two weeks after the winter solstice, (December 21) when the warming radiation from the sun is least and the days are shortest.   Interestingly, in the summer there is a much longer lag between the maximum solar radiation on the summer solstice (June 21) and our warmest temperatures (early August). Clearly, solar radiation at the top of the atmosphere is not the only story for surface temperatures-weather systems and clouds play a role as well.  For example, in summer we have lots of low clouds and onshore flow in June and early July that slows the warming.

Talking of climatological records, December broke one: Seattle had 27 days of measurable precipitation last month, an ALL TIME RECORD for December.  The old record was 26 days.

There is now a large pressure difference across the Cascades, with high pressure entrenched over eastern Washington (see map) and an offshore trough approaching.  The result has been very strong

winds in the Gorge, with some  "favored" spots hitting 70-80 mph.  One of the windiest places is the Vista House at Crown Point, where recent gusts have hit 78 mph, with sustained winds in the 40+ mph range (see graphic).


Finally, lets end with something we have not seen in while...a nice sunset shot.  But this one had an added twist.   Taken from my department, here was a low level contrail from a jet that left a shadow on a higher cloud deck....its above the third tower on the left side of the photo.