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
59.6
72
58
57
47
65
February
77.9
62
79
81
80
87
March
86.3
85
86
98
89
81
April
89.9
81
93
90
95
May
90.7
87
94
95
99
June
92.6
95
98
84
94
July
92.6
91
97
87
90
August
92.8
93
96
88
97
September
89.9
93
89
90
88
October
88.2
87
91
91
88
November
75.7
78
79
64
83
December
63.9
71
61
53
68
Average
84.2
74.0
85.0
89.3
82.4
88.1
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.