Climate at a Glance | Statewide Rankings | National Centers for Environmental Information (NCEI)

Statewide Rankings

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Please note, Degree Days and Palmer Indices are not available for Alaska or Hawaii. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Iowa

September 1989 Palmer Modified Drought Index (PMDI) Rankings

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Record Driest

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
September 1989 1-Month	-3.60	0.20	-3.80	6th Driest	Driest since: 1988	1934
September 1989 1-Month	-3.60	0.20	-3.80	125th Wettest	Wettest since: 1987	1993

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NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published June 2025, retrieved on June 17, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings

Climate at a Glance Statewide Rankings

Statewide Rankings

Iowa

September 1989 Palmer Modified Drought Index (PMDI) Rankings

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