| Year | Confi. Interval | Confi. Level | Temperature (˚C) | Level | |
| From | To | ||||
| 1961 | (1960,1978) | 98% | 27.12 | 27.79 | |
| 1986 | (1962,1987) | 99% | 27.79 | 28.40 | |
| 2001 | (1999,2003) | 100% | 28.40 | 28.92 | |