ValueRankAnomalyMean

Divisional Palmer Z-Index

December 1977 - February 1978

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Pennsylvania (Hover over a Climate Division)

Z-IndexPalmer Z-Index: 1.73

Rank: 9th Wettest

Anomaly: 1.63

Mean: 0.10

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December 1977 - February 1978 Pennsylvania Divisional Palmer Z-Index

Climate Division	Value	Rank 130 Years	Anomaly	1901-2000 Mean
1. Pocono Mountains	2.12	125	2.06	0.06
2. East Central Mountains	2.13	125	1.99	0.14
3. Southeastern Piedmont	2.21	126	2.09	0.12
4. Lower Susquehanna	1.98	124	1.87	0.11
5. Middle Susquehanna	2.26	127	2.12	0.14
6. Upper Susquehanna	2.78	129	2.76	0.02
7. Central Mountains	1.48	120	1.39	0.09
8. South Central Mountains	1.12	108	1.04	0.08
9. Southwest Plateau	0.44	82	0.33	0.11
10. Northwest Plateau	1.10	108	1.03	0.07

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published July 2025, retrieved on July 17, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping