| Percent Frequencies by Type of Cloud Cover | | Month | Clear | Scattered | Broken | Overcast |
| January |
0.2 % |
59.6 % |
39.4 % |
0.9 % |
| February |
0.1 % |
50 % |
48.8 % |
1.1 % |
| March |
0.1 % |
51.8 % |
46.7 % |
1.5 % |
| April |
0.2 % |
43.4 % |
53.6 % |
2.8 % |
| May |
0 % |
38.4 % |
55.8 % |
5.8 % |
| June |
0 % |
31 % |
61.4 % |
7.5 % |
| July |
0 % |
39.2 % |
55 % |
5.7 % |
| August |
0.1 % |
41.3 % |
54.6 % |
4 % |
| September |
0.2 % |
42.4 % |
49.9 % |
7.5 % |
| October |
0.3 % |
46 % |
48.5 % |
5.2 % |
| November |
0.1 % |
47.2 % |
49 % |
3.7 % |
| December |
0.1 % |
53.1 % |
44.1 % |
2.7 % |
| Annual |
0.1 % |
45.4 % |
50.4 % |
4 % |
|