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
84.5
86
89
76
95
80
February
83.8
75
89
89
91
82
March
86.9
88
87
98
85
89
April
91.0
98
95
97
92
May
85.0
74
87
87
94
June
85.0
87
80
89
85
July
87.6
92
90
85
89
August
93.8
94
92
98
90
September
92.1
86
98
87
88
October
90.7
93
89
85
96
November
91.9
94
94
89
87
December
89.2
89
95
89
93
Average
87.8
83.2
88.6
89.8
89.4
89.0
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.