Value Anomaly Rank Mean

Divisional Palmer Z-Index

September - November 1928

-4-3-2-11234

Pennsylvania (Hover over a Climate Division)

Z-Index Palmer Z-Index : -1.12

Anomaly: -1.09

Rank: 26th Driest

Mean: -0.03

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*Signifies a tie

**Insufficient variability in the data record renders rank insignificant

September - November 1928 Pennsylvania Divisional Palmer Z-Index

Climate Division	Value	Anomaly	Rank 130 Years	1901-2000 Mean
1. Pocono Mountains	-1.74	-1.70	13	-0.04
2. East Central Mountains	-1.66	-1.63	15	-0.03
3. Southeastern Piedmont	-0.81	-0.77	37	-0.04
4. Lower Susquehanna	-0.42	-0.40	47	-0.02
5. Middle Susquehanna	-1.80	-1.77	15	-0.03
6. Upper Susquehanna	-1.62	-1.59	15	-0.03
7. Central Mountains	-1.25	-1.21	26	-0.04
8. South Central Mountains	-1.23	-1.19	27	-0.04
9. Southwest Plateau	-1.31	-1.28	23	-0.03
10. Northwest Plateau	-0.04	-0.03	58	-0.01

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published July 2025, retrieved on July 29, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping