Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
6.9
10
0
1
5
14
February
14.3
36
7
10
0
14
March
27.7
59
23
15
8
30
April
57.3
58
76
43
49
May
75.6
73
74
75
75
June
69.7
67
78
50
70
July
70.4
93
89
65
70
August
71.3
51
94
55
63
September
76.3
79
78
87
74
October
58.5
46
76
54
72
November
42.4
50
40
26
46
December
18.9
32
0
13
3
Average
49.2
36.5
49.7
58.7
46.1
50.2
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.