| | PCI distribution | PCI range | Annual | SWM | NEM |
| | Uniform precipitation | <10 | NA | Ratnapura | NA | | Moderate precipitation | 11 to 15 | Kurunegala, Katugastota, Badulla, Colombo, Ratnapura, Wellawaya, Galle | Trincomalee, Batticaloa, Kurunegala, Katugastota, Badulla, Colombo, Wellawaya, Galle, Hambantota | Vavuniya, Trincomalee, Puttalam, Mahailluppallama, Parakrama Samudraya, Batticaloa, Kurunegala, Katugastota, Badulla, Colombo, Ratnapura, Wellawaya, Galle, Hambantota | | Irregular | 16 to 20 | Vavuniya, Trincomalee, Puttalam, Mahailluppallama, Parakrama Samudraya, Batticaloa, Hambantota | Jaffna, Vavuniya, Puttalam, Mahailluppallama, Parakrama Samudraya, | Jaffna | | Strong irregularity | >20 | Jaffna | NA | NA |
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