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
77.1
86
66
68
85
85
February
71.8
76
62
52
75
84
March
79.9
85
92
51
77
88
April
87.5
78
82
86
92
94
May
86.7
91
68
96
86
June
88.7
93
85
88
97
July
96.5
97
97
98
99
August
92.1
93
98
88
96
September
94.9
97
88
96
98
October
95.3
86
95
98
99
November
90.8
97
74
97
93
December
85.7
91
78
89
75
Average
86.6
81.2
87.0
77.7
90.0
91.0
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.