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
73.7
87
84
71
54
77
February
81.3
81
87
90
81
78
March
87.1
94
79
96
87
87
April
92.9
95
86
92
100
May
96.7
97
100
97
98
June
97.0
97
99
97
94
July
97.6
99
99
98
97
August
96.5
96
98
96
97
September
93.4
95
87
90
100
October
89.8
85
90
94
93
November
73.5
83
62
84
72
December
59.5
76
60
65
69
Average
89.1
87.9
91.3
90.3
89.0
91.1
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.