| Year | Confi. Interval | Confi. Level | Temperature (˚C) | Level | |
| From | To | ||||
| 1957 | (1955,1959) | 97% | 30.36 | 30.90 | |
| 1961 | (1961,1963) | 100% | 30.90 | 33.93 | |
| 1980 | (1971,1981) | 99% | 33.93 | 32.52 | |
| 1984 | (1988,1995) | 100% | 32.52 | 31.64 | |