Month

2011 y-2012 y

2012 y-2013 y

2013 y-2014 y

average temperature

negative accumulated temperature

average temperature

negative accumulated temperature

average temperature

negative accumulated temperature

11

6.4

−0.1

4.1

−3.0

6.4

−1.9

12

−1.3

−63.7

−4.1

−127.5

0.7

−31.3

1

−3.5

−137.2

−3.9

−120.9

0.4

−20.3

2

−1.4

−28.3

−0.6

−41.0

0.2

−33.4

3

5.8

6.5

10.3

4

15.7

12.8

17.4

Average

3.6

−57.3

2.5

−73.1

5.9

−21.7

Overwintering rate (%)

75.2

38.9

93.4