ValueRankAnomalyMean

Divisional Palmer Z-Index

October - December 1964

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Wyoming (Hover over a Climate Division)

Z-IndexPalmer Z-Index: 0.54

Rank: 46th Wettest

Anomaly: 0.40

Mean: 0.14

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October - December 1964 Wyoming Divisional Palmer Z-Index

Climate Division	Value	Rank 130 Years	Anomaly	1901-2000 Mean
1. Yellowstone Drainage	1.99	117	1.92	0.07
2. Snake Drainage	2.42	126	2.51	-0.10
3. Green and Bear Drainage	0.86	107	0.93	-0.06
4. Big Horn	0.76	95	0.63	0.13
5. Powder, Little Mo and Tongue Drainages	0.46	86	0.25	0.21
6. Belle Fourche Drainage	-0.03	61	-0.36	0.33
7. Cheyenne Niobrara Drainage	-0.79	17	-1.04	0.25
8. Lower Platte	-0.99	15	-1.29	0.30
9. Wind River	-0.26	47	-0.34	0.08
10. Upper Platte	-0.58	36	-0.71	0.13

Citing This Page

• NOAA National Centers for Environmental information, Climate at a Glance: Divisional Mapping, published June 2025, retrieved on July 7, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/mapping