ValueAnomalyRankMean

Divisional Palmer Z-Index

August - October 2018

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Iowa (Hover over a Climate Division)

Z-IndexPalmer Z-Index: 4.45

Anomaly: 4.38

Rank: Wettest

Mean: 0.07

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August - October 2018 Iowa Divisional Palmer Z-Index

Climate Division	Value	Anomaly	Rank 130 Years	1901-2000 Mean
1. Northwest	3.78	3.66	129	0.12
2. North Central	4.64	4.53	130	0.12
3. Northeast	6.09	6.01	130	0.08
4. West Central	3.56	3.43	129	0.14
5. Central	4.39	4.30	130	0.09
6. East Central	4.40	4.37	130	0.04
7. Southwest	3.37	3.41	129	-0.04
8. South Central	2.57	2.56	124	0.01
9. Southeast	2.31	2.30	122	0.01

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published June 2025, retrieved on June 9, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping