Agricultural and Meteorological Software
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What is the unit of Y-Axis in drought severity graph?

Drought Severity Unit

Y-Axis is severity and doesn't have unit. Its unit depends on your index (CZI). The tallest column is 21.5 that calculate(in RDIT): Severity= abs(CZI_1963.11-border)+abs(CZI_1963.12-border)+abs(CZI_1964.1-border)+.......+abs(CZI_1965.9-border)=21.5

But I think you selected threshold = 0. It's not good. Please read Mckee 1996. You should select threshold= -0.99 you can visit SPI threshold