Washington Climate Trends

Mark Albright was State Climatologist for Washington from 1987 though 2003. Recently he sent me the following:

Not only is our mountain snowpack not declining here in Washington State:
http://www.atmos.washington.edu/marka/swe.waor_west.1976-2008.gif
but we should also feel fortunate that our climate has been cooling over the past 20 years.  We already have seen data from western Washington showing that trend, summarized here:

———-  Olympia     SeaTac
1989-1998    50.7        53.0
1999-2008    50.1        52.2
Difference   -0.6        -0.8

But Hanford in eastern Washington has perhaps the highest quality climate record available from the state of Washington in a rural undeveloped region with a homogeneous record spanning 66 years (1945-2010).  Their temperature has cooled about -1.5 deg F over the past 20 years to a level below the 66-yr period of record mean:

Mean Temperature (deg F):

1988-1994: 54.8 -> peak of warming circa 1991
2006-2010: 53.3 -> cooling of -1.5 deg F since 1991
1945-2010: 53.5 -> full 66-yr period of record

Time Series Graphs 1986 – 2010
Annual 12 months:
http://www.atmos.washington.edu/marka/tmean.hms.Annual.1986-2010.gif
Winter 5 months:
http://www.atmos.washington.edu/marka/tmean.hms.Nov-Mar.1986-2010.gif
Summer 5 months:
http://www.atmos.washington.edu/marka/tmean.hms.May-Sep.1986-2010.gif
Even 6 months:
http://www.atmos.washington.edu/marka/tmean.hms.Even_Months.1986-2010.gif
Odd 6 months:
http://www.atmos.washington.edu/marka/tmean.hms.Odd_Months.1986-2010.gif

7 of the 12 warmest months occurred from 1988 – 1994 as seen in this table of monthly mean temperatures at Hanford WA:
http://hms.pnl.gov/monmean.htm

This 20 year cooling period corresponds to a transition from the peak of a warm PDO phase to a cooler PDO phase from 1991 to 2010:
http://jisao.washington.edu/pdo/img/pdo_latest.jpeg

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