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
74.6
64
71
88
70
72
February
84.0
77
93
87
79
80
March
84.6
75
78
91
95
85
April
90.1
85
90
92
85
May
90.9
90
91
89
91
June
87.3
85
85
93
84
July
91.3
90
97
84
98
August
89.8
89
92
91
85
September
90.5
90
92
93
93
October
79.8
72
75
83
78
November
74.0
54
64
88
82
December
72.7
66
79
78
76
Average
83.8
72.1
81.1
86.9
86.9
84.7
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.