Latitude | 1948-58 | 1958-68 | 1968-78 | 1978-88 | 1988-98 | 1998-2008 | 2008-2014 | |||||||
min | max | min | max | min | max | min | max | min | max | min | max | min | max | |
January | 20 | 25 | 17 | 25 | 17 | 22 | 19 | 23 | 18 | 23 | 19 | 22 | 20 | 23 |
February | 20 | 27 | 15 | 25 | 18 | 25 | 18 | 24 | 17 | 24 | 17 | 23 | 17 | 23 |
March | 17 | 25 | 8 | 15 | 15 | 25 | 15 | 25 | 15 | 23 | 18 | 23 | 20 | 25 |
April | 18 | 23 | 16 | 24 | 16 | 21 | 17 | 22 | 19 | 21 | 17 | 22 | 15 | 23 |
May | 19 | 24 | 21 | 24 | 19 | 23 | 19 | 24 | 19 | 24 | 20 | 24 | 19 | 23 |
June | 43 | 51 | 38 | 45 | 41 | 45 | 34 | 45 | 43 | 51 | 44 | 47 | 42 | 48 |
July | 44 | 47 | 39 | 40 | 40 | 50 | 39 | 47 | 36 | 49 | 43 | 52 | 43 | 49 |
August | 44 | 49 | 43 | 47 | 43 | 49 | 40 | 47 | 40 | 45 | 43 | 50 | 41 | 47 |
September | 40 | 45 | 40 | 46 | 38 | 50 | 37 | 44 | 40 | 52 | 43 | 47 | 40 | 47 |
October | 24 | 30 | 22 | 27 | 24 | 27 | 22 | 27 | 24 | 29 | 24 | 30 | 25 | 29 |
November | 20 | 27 | 22 | 25 | 20 | 25 | 20 | 25 | 19 | 25 | 22 | 25 | 22 | 37 |
December | 21 | 27 | 20 | 25 | 20 | 25 | 20 | 25 | 22 | 25 | 18 | 26 | 22 | 25 |