| S1 Class Limits |
Type of Rainfall Seasonality |
| 0.19 and above |
Very equable |
| 0.20 – 0.39 |
Equable with a definite wetter season |
| 0.40 – 0.59 |
Rather seasonal with a short drier season |
| 0.60 – 0.79 |
Seasonal |
| 0.80 – 0.99 |
Markedly seasonal with a long drier season |
| 1.00 – 1.19 |
Most rains in 3 months or less |
| 1.20 and above |
Extreme, almost all rain in 1-2 months |
