*3.1. Tmax in the Winter Season in the Years 1966/67–2015/16 (Pozna ´n-Ławica)*

The average Tmax in winter (December-February) in the years 1966/67-2015/16 in Pozna ´n amounted to 2.3 ◦C. The lowest average Tmax was recorded in the season 1969/70. It amounted to −2.8 ◦C (Figure 2). Equally cold seasons occurred in the years 1984/85, 1995/96, 1978/79, 1986/87, as well as 2009/10 and 2010/11. The highest average Tmax, amounting to 6.0 ◦C, was recorded in seasons 1989/90 and 2006/07. Moreover, warm winters with an average considerably above norm occurred in the years 1997/98, 2015/16, 1988/89, 1974/75, and 2007/08. Standard deviation for the given multi-annual period amounted to 2.2 ◦C. An increase in Tmax at a level of 0.36 ◦C was recorded in the analyzed years, although the changes were not statistically significant.

**Figure 2.** Course of the average Tmax in the winter season with long-term average value in Pozna ´n-Ławica in the years 1966–2015.
