| Percent Frequencies by Type of Cloud Cover | | Month | Clear | Scattered | Broken | Overcast |
| January |
3.1 % |
53.8 % |
41.2 % |
1.9 % |
| February |
1.7 % |
50 % |
46 % |
2.3 % |
| March |
3 % |
45.2 % |
49.9 % |
1.9 % |
| April |
1.5 % |
36.6 % |
58.1 % |
3.8 % |
| May |
1.2 % |
34.4 % |
58.6 % |
5.8 % |
| June |
0.5 % |
25.5 % |
61.9 % |
12.1 % |
| July |
0.9 % |
35.8 % |
56.9 % |
6.4 % |
| August |
1.1 % |
36.5 % |
57.8 % |
4.7 % |
| September |
1 % |
34.2 % |
58.6 % |
6.1 % |
| October |
0.9 % |
32.5 % |
60.7 % |
5.9 % |
| November |
1.1 % |
33.2 % |
60.1 % |
5.6 % |
| December |
1.3 % |
39.9 % |
53.7 % |
5.2 % |
| Annual |
1.4 % |
38.1 % |
55.3 % |
5.1 % |
|