| Mean number of days (24-hr period) within months | |||||||||||
| Response Class1 | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | Yearly | Range in % over 50 sites | |
| Total | 3% | ||||||||||
| aa | 30 | 15.5 | 0.8 | 0.9 | 0.1 | 0.2 | 1 | 16.5 | 65 | 26.8 | 17.3 - 40.0 |
| bb | 0 | 0 | 0.3 | 1.8 | 0.4 | 0.2 | 0.1 | 0 | 2.8 | 1.2 | 0.0 - 4.9 |
| cc | 0 | 0 | 0 | 0 | 0.2 | 0.1 | 0 | 0 | 0.3 | 0.1 | 0.0 - 2.1 |
| ab | 0.1 | 15.6 | 20.1 | 9.5 | 2.1 | 3 | 23.8 | 13.5 | 87.7 | 36.2 | 23.6 - 42.1 |
| ac | 0 | 0 | 7.1 | 3.4 | 7.9 | 10.2 | 4.7 | 0 | 33.3 | 13.8 | 5.0 - 24.8 |
| bc | 0 | 0 | 1.2 | 15.4 | 20.7 | 14.8 | 1.6 | 0 | 53.7 | 22 | 8.7 - 33.9 |
| Daily temperature (˚C) | Mean | Correlation (r) | |||||||||
| Max | 24 | 19 | 13 | 7 | 5 | 7 | 13 | 21 | 14 | Max vs. Min | |
| Min | 13 | 7 | 1 | −1 | −3 | −2 | 2 | 7 | 3 | r = 0.378** | |
| Difference | 11 | 12 | 12 | 8 | 8 | 9 | 11 | 14 | 11 | ||