| Percent Frequencies by Type of Cloud Cover | | Month | Clear | Scattered | Broken | Overcast |
| January |
7.1 % |
72.6 % |
17.4 % |
3 % |
| February |
6.4 % |
71.7 % |
17.8 % |
4.1 % |
| March |
5.7 % |
73.1 % |
16.3 % |
4.9 % |
| April |
4.2 % |
67.4 % |
21.4 % |
7 % |
| May |
1.8 % |
56.5 % |
28.3 % |
13.4 % |
| June |
1 % |
62.6 % |
25.1 % |
11.4 % |
| July |
1.2 % |
67.3 % |
21.7 % |
9.8 % |
| August |
1.1 % |
70 % |
20.7 % |
8.2 % |
| September |
2 % |
63.5 % |
23.7 % |
10.8 % |
| October |
2.3 % |
65.1 % |
22.5 % |
10.1 % |
| November |
2.6 % |
68.3 % |
19.8 % |
9.4 % |
| December |
5.8 % |
69.9 % |
19.3 % |
5 % |
| Annual |
3.4 % |
67.3 % |
21.2 % |
8.1 % |
|