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
69.2
87
76
84
43
42
February
66.2
66
92
87
43
53
March
58.4
52
69
82
67
49
April
51.2
78
68
37
40
May
50.5
60
70
22
48
June
67.9
78
84
70
35
July
71.6
68
94
46
61
August
70.0
81
89
50
54
September
59.7
76
58
67
51
October
57.4
56
76
59
32
November
51.8
75
76
31
91
December
47.5
81
55
27
19
Average
57.5
66.7
73.4
77.6
47.4
45.6
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.