| Time Interval |
1900-1930 |
1930-1960 |
1960-1990 |
1990-2009 |
| Month |
|
|
|
|
| January |
41.04 |
41.39 |
35.84 |
37.49 |
| February |
39.03 |
42.49 |
41.9 |
52.21 |
| March |
31.79 |
33.94 |
45.67 |
36.83 |
| April |
28.39 |
29.95 |
32.71 |
35.47 |
| May |
36.61 |
34.57 |
40.96 |
42.27 |
| June |
129.01 |
130.59 |
122.54 |
108.9 |
| July |
246.38 |
285.33 |
282.79 |
177.22 |
| August |
246.6 |
227.57 |
240.1 |
175 |
| September |
148.76 |
140 |
140.21 |
113.73 |
| October |
15.55 |
23.74 |
21.86 |
10.04 |
| November |
12.88 |
9.75 |
10.62 |
11.97 |
| December |
16.05 |
15.84 |
17.66 |
12.49 |
| Standard Deviation |
88.06 |
91.28 |
91.54 |
60.75 |
|
