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
75.1
64
77
87
85
49
February
67.3
59
74
82
61
68
March
75.6
64
92
69
46
81
April
90.0
90
97
96
75
May
98.1
99
99
95
99
June
98.8
97
99
99
100
July
98.2
98
100
97
99
August
97.6
98
98
97
97
September
98.3
99
98
99
96
October
94.9
92
94
100
88
November
88.7
88
93
96
93
December
81.6
71
83
91
90
Average
86.2
62.4
90.2
92.3
89.2
86.5
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.