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Degree of severity based on Standardized Precipitation Index (SPI).
| SPI values | Category |
|---|---|
| ≥2.00 | Extreme wet |
| 1.50–1.99 | Severe wet |
| 1.00–1.49 | Moderate wet |
| −0.99–0.99 | Near normal |
| −1.00 ∼ −1.49 | Moderate drought |
| −2.00 ∼ −1.50 | Severe drought |
| ≤ - 2.00 | Extreme drought |
This study applied Climpact package in R-programming software to calculate SPI values at 4 different time scales (1, 3, 6 and 12).
