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
50.0
33
59
53
43
68
February
55.5
62
47
53
46
72
March
69.6
77
69
65
57
73
April
81.8
90
76
68
99
May
87.0
88
78
91
99
June
87.8
90
88
77
98
July
73.8
80
70
59
76
August
78.2
85
67
86
71
September
80.5
80
83
68
80
October
62.7
74
58
50
52
November
39.7
29
41
33
42
December
47.5
49
49
40
52
Average
68.4
58.0
71.7
66.7
58.7
73.0
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.