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
84.1
82
78
83
90
83
February
86.0
85
89
86
81
87
March
86.3
83
85
87
85
89
April
87.3
93
87
92
82
May
77.4
71
80
73
89
June
67.7
71
45
69
73
July
75.7
85
66
68
86
August
74.9
69
69
64
72
September
78.4
76
64
70
72
October
64.9
88
34
73
0
November
85.9
97
84
92
57
December
87.2
90
93
87
88
Average
79.0
83.2
80.6
70.6
75.7
74.6
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.