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
68.4
80
76
55
53
67
February
83.5
79
82
77
85
88
March
89.5
85
88
96
92
87
April
90.5
90
91
94
93
May
90.9
86
92
97
98
June
91.6
95
94
85
96
July
87.6
93
99
45
90
August
93.5
89
96
95
96
September
89.6
89
87
89
88
October
90.0
92
90
87
87
November
73.0
84
82
73
63
December
65.7
76
59
60
53
Average
85.6
81.8
87.4
87.4
80.6
86.1
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.