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Distribution of days with and without ISSHL events for each weather type (cluster)
| Weather type (Cluster) | Days | Frequency (%) of ISSHL events | |
| 0 | 1 | ||
| (No ISSHL case) | (One ISSHL case) | ||
| 1 | 187 | 12 | 6.0 % |
| 2 | 117 | 6 | 4.9 % |
| 3 | 202 | 10 | 4.7 % |
| 4 | 98 | 6 | 5.8 % |
| 5 | 344 | 14 | 3.9 % |
| 6 | 451 | 17 | 3.6 % |
| 7 | 87 | 5 | 5.4 % |
| 8 | 257 | 12 | 4.5 % |
