B 12 11 April August December February January July June March May November October September [-10;-5] [-15;-10] [-20;-15] [-25;-20] [-5;0] [0;5] [10;15] [15;20] [20;25] [25;30] [5;10] .....XXX..X ......XXXX. XXXXXX....X XXX.XXX...X XXX.XX....X ......XXXX. ......XXXX. XX..XXXX..X ......XXXXX XX..XXXX..X ....XXXXX.X ......XXX.X