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
76.2
75
85
63
71
74
February
80.1
68
91
73
83
80
March
87.5
85
83
90
94
89
April
92.5
89
93
98
86
May
90.5
86
96
93
89
June
92.4
98
92
91
92
July
90.0
82
99
91
84
August
89.7
84
90
90
91
September
87.4
92
90
90
87
October
83.9
86
81
87
87
November
88.0
88
87
93
88
December
76.5
79
80
65
87
Average
86.1
76.8
86.9
88.3
88.6
86.6
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.