min Apr

max Apr

min May

max May

min Jun

max Jun

1948-58

18

23

19

24

43

51

1958-68

16

24

21

24

38

45

1968-78

16

21

19

23

41

45

1978-88

17

22

19

24

34

45

1988-98

19

21

19

24

43

51

1998-2008

17

22

20

24

44

47

2008-2014

15

23

19

23

42

48