Climate of Olympia WA: number of hot days

For Olympia Airport, (1941-2015), I have compiled the number of “hot” days (>= 89 F) per decade.  The threshold temperature for a hot day was set to make an annual mean frequency of about 7 days per year.
1940s*    68 days
1950s     69
1960s     76
1970s     76
1980s     81
1990s     78
2000s     70
2010s*    77
* Normalized to 10 years
There was a slight uptick going from the 1950s into the 1960s, but there has been little change over the past 6 decades (since the 1960s) in the number of “hot” days per year.
Years with greatest number of “hot” days at Olympia Airport:
1) 1967   20 days
2) 1958   19
3) 2015   18
4) 1981   17
5) 1985   15
5) 1992   15
5) 2009   15
 
Years with least number of “hot” days at Olympia Airport:
1) 2011    0 days
1) 1976    0
1) 1964    0
1) 1954    0
2) 1983    1
2) 1966    1
2) 1957    1
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