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
65.4
69
71
65
80
44
February
63.8
87
68
57
75
55
March
93.4
98
96
97
82
90
April
97.5
99
96
94
100
May
94.7
94
94
96
100
June
90.8
94
89
95
83
July
88.7
94
96
88
79
August
84.2
92
83
79
91
September
82.4
88
89
78
74
October
85.5
94
91
91
85
November
94.4
95
93
96
97
December
76.4
78
87
45
82
Average
84.1
85.2
87.9
86.0
82.1
79.0
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.