| Percent Frequencies by Type of Cloud Cover | | Month | Clear | Scattered | Broken | Overcast |
| January |
0.1 % |
78.5 % |
21 % |
0.4 % |
| February |
0.2 % |
75.5 % |
23.6 % |
0.7 % |
| March |
0.2 % |
76 % |
22.7 % |
1 % |
| April |
0.1 % |
67.8 % |
29.9 % |
2.1 % |
| May |
0 % |
55.1 % |
40.8 % |
4.1 % |
| June |
0 % |
61.9 % |
35.9 % |
2.2 % |
| July |
0 % |
65 % |
33.1 % |
2 % |
| August |
0 % |
68.8 % |
28.4 % |
2.8 % |
| September |
0 % |
64.8 % |
31.7 % |
3.5 % |
| October |
0.1 % |
64.9 % |
32.7 % |
2.3 % |
| November |
0 % |
66.7 % |
29.1 % |
4.2 % |
| December |
0.1 % |
72.5 % |
26 % |
1.4 % |
| Annual |
0.1 % |
68.1 % |
29.6 % |
2.3 % |
|