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
67.6
74
66
85
49
68
February
72.7
72
86
60
65
78
March
80.7
64
85
83
88
88
April
90.0
91
91
88
93
May
91.2
96
97
82
95
June
94.0
95
93
95
93
July
92.0
90
94
96
81
August
89.3
85
89
89
93
September
80.0
80
80
87
84
October
73.9
92
87
60
53
November
58.8
38
45
71
67
December
59.3
52
59
73
40
Average
82.6
68.7
85.3
85.8
83.5
83.3
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.