ValueAnomalyRankMean

Divisional Palmer Z-Index

October - December 2020

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Washington (Hover over a Climate Division)

Z-IndexPalmer Z-Index: -0.17

Anomaly: -0.09

Rank: 54th Driest

Mean: -0.07

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October - December 2020 Washington Divisional Palmer Z-Index

Climate Division	Value	Anomaly	Rank 130 Years	1901-2000 Mean
1. West Olympic Coast	-0.19	-0.15	57	-0.04
2. North East Olympic San Juan	0.51	0.46	74	0.05
3. Puget Sound Lowlands	-0.06	0.03	61	-0.09
4. East Olympic Cascade Foothills	-0.16	-0.10	58	-0.06
5. Cascade Mountains West	0.12	0.18	76	-0.07
6. East Slope Cascades	0.06	0.10	67	-0.04
7. Okanogan Big Bend	-0.31	-0.25	56	-0.06
8. Central Basin	-0.78	-0.80	39	0.02
9. Northeastern	-0.47	-0.28	55	-0.19
10. Palouse Blue Mountains	-0.52	-0.54	52	0.02

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published April 2025, retrieved on April 10, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping