PNA extreme days
over 1948-1997
by calendar month
Nov
Dec
Jan
Feb
Mar
Extreme
High PNA
12.1%
(152)
21.0%
(264)
25.7%
(324)
21.6%
(272)
19.7%
(248)
Extreme
Low PNA
14.3%
(180)
21.2%
(267)
21.3%
(268)
23.3%
(293)
20.0%
(252)
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