Jun | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec | |
1984-1993 | 23.3 | 27.9 | 18.9 | 5.2 | −23.2 | −23.2 | −33.3 | −39.7 | −43.2 | −37.1 | −12.7 | 21.1 |
1994-2003 | 49.9 | 11.5 | 8.4 | 9.4 | −18.6 | −29.1 | −42.1 | −39.8 | −29.3 | −13.8 | 4.1 | 56.1 |
2004-2016 | 22.1 | 22.1 | 12.1 | −13.1 | −16.2 | −41.5 | −48.3 | −49.2 | −27.2 | −10.6 | 30.6 | 14.5 |
N=Average(D) | 31.7 | 20.5 | 13.4 | 0.5 | −19.4 | −31.5 | −41.3 | −42.1 | −33.2 | −20.8 | 7.3 | 30.6 |