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
88.9
94
97
92
90
83
February
80.6
88
79
71
77
86
March
79.4
89
83
47
73
84
April
87.7
87
91
90
89
May
80.9
78
74
95
85
June
72.9
87
84
76
61
July
91.8
90
97
92
89
August
96.7
89
99
97
98
September
95.0
93
97
94
99
October
91.9
91
94
85
99
November
94.1
92
95
93
97
December
90.8
91
92
93
97
Average
87.6
90.2
88.0
85.7
87.7
88.4
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.