| Percent Frequencies by Type of Cloud Cover | | Month | Clear | Scattered | Broken | Overcast |
| January |
6.5 % |
56.1 % |
11.7 % |
25.8 % |
| February |
6.3 % |
63 % |
9.1 % |
21.7 % |
| March |
5.6 % |
70 % |
8.9 % |
15.5 % |
| April |
6.2 % |
61.1 % |
9.3 % |
23.5 % |
| May |
2 % |
45.4 % |
11.5 % |
41 % |
| June |
1.3 % |
30.6 % |
12.3 % |
55.7 % |
| July |
0.7 % |
28.3 % |
14.4 % |
56.5 % |
| August |
1.3 % |
30.5 % |
16.1 % |
52.1 % |
| September |
0.8 % |
29 % |
13.5 % |
56.7 % |
| October |
1.8 % |
41.3 % |
14.4 % |
42.5 % |
| November |
1.9 % |
44.7 % |
11.3 % |
42.2 % |
| December |
5.8 % |
54.8 % |
12.7 % |
26.6 % |
| Annual |
3.4 % |
46.7 % |
12.1 % |
37.8 % |
|