| Time | equation | r |
Spring | 00:00-23:50 | y = 0.656x + 8.141 | 0.8516** |
Summer | 00:00-06:40 | y = 0.823x + 4.398 | 0.8971** |
06:40-21:50 | y = 0.758x + 5.578 | 0.8943** | |
21:50-23:50 | y = 0.720x + 6.722 | 0.8357** | |
Autumn | 00:00-08:40 | y = 0.820x + 3.482 | 0.9558** |
08:40-17:40 | y = 0.833x + 1.833 | 0.9646** | |
17:40-23:50 | y = 0.833x + 3.165 | 0.9645** | |
Winter | 00:00-23:50 | y = 0.790x + 6.183 | 0.7809** |