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
71.8
76
85
61
69
69
February
74.1
83
64
56
78
71
March
82.9
88
77
79
90
86
April
92.5
100
88
92
96
May
98.7
99
97
98
100
June
97.9
99
97
98
95
July
99.1
99
100
99
99
August
98.9
100
100
100
98
September
96.9
97
90
98
98
October
89.6
86
87
94
98
November
75.3
62
62
81
78
December
68.1
68
87
69
77
Average
88.4
83.0
89.4
86.8
91.3
91.2
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.