Table 2. Air temperature and number of FTDs in Kalisz, Koło and Łódź in 1951/52–2017/18.
| Station | Mean annual temperature (Aug.–Jul.) [°C] | Warmest year [°C] | Coldest year [°C] | Mean annual FTDs | Annual maximum FTDs | Annual minimum FTDs |
|---|---|---|---|---|---|---|
| 1951/1952–2017/2018 | ||||||
| Kalisz | 8.5 | 10.9 (2006/07) | 6.3 (1962/63) | 65.6 | 96 (1956/57) | 29 (2006/07) |
| Koło | 8.4 | 10.7 (2006/07) | 6.5 (1962/63) (1969/70) | 64.2 | 101 (1973/74) | 34 (2006/07) |
| Łódź | 8.1 | 10.4 (2006/07) | 6.2 (1962/63) | 71.4 | 102 (1973/74) | 41 (2009/10) |
| 1951/1952–1990/1991 | ||||||
| Kalisz | 8.0 | 9.9 (1982/83) (1989/90) | 6.3 (1962/63) | 70.7 | 96 (1956/57) | 46 (1985/86) (1989/90) |
| Koło | 8.0 | 9.9 (1989/90) | 6.5 (1962/63) (1969/70) | 66.0 | 101 (1973/74) | 40 (1985/86) |
| Łódź | 7.7 | 9.6 (1982/83) | 6.2 (1962/63) | 73.9 | 102 (1973/74) | 44 (1989/90) |
| 1991/1992–2017/2018 | ||||||
| Kalisz | 9.2 | 10.9 (2006/07) | 7.1 (1995/96) | 58.2 | 82 (1991/92) | 29 (2006/07) |
| Koło | 9.0 | 10.7 (2006/07) | 6.8 (1995/96) | 61.5 | 77 (1996/97) | 34 (2006/07) |
| Łódź | 8.7 | 10.4 (2006/07) | 6.8 (1995/96) | 67.7 | 82 (1994/95) | 41 (2009/10) |