Value Anomaly Rank Mean

Divisional Palmer Z-Index

December 1917 - February 1918

-4-3-2-11234

Pennsylvania (Hover over a Climate Division)

Z-Index Palmer Z-Index : -0.23

Anomaly: -0.33

Rank: 50th Driest

Mean: 0.10

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*Signifies a tie

**Insufficient variability in the data record renders rank insignificant

December 1917 - February 1918 Pennsylvania Divisional Palmer Z-Index

Climate Division	Value	Anomaly	Rank 130 Years	1901-2000 Mean
1. Pocono Mountains	-0.47	-0.53	44	0.06
2. East Central Mountains	0.29	0.14	80	0.14
3. Southeastern Piedmont	0.07	-0.05	67	0.12
4. Lower Susquehanna	0.28	0.17	81	0.11
5. Middle Susquehanna	0.22	0.08	69	0.14
6. Upper Susquehanna	-0.77	-0.80	26	0.02
7. Central Mountains	-0.17	-0.26	45	0.09
8. South Central Mountains	0.47	0.39	85	0.08
9. Southwest Plateau	-0.28	-0.39	41	0.11
10. Northwest Plateau	-0.68	-0.74	28	0.07

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published July 2025, retrieved on July 22, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping