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
66.5
69
50
77
76
69
February
71.3
55
74
80
72
84
March
78.9
71
71
86
88
79
April
92.3
87
94
95
98
May
92.7
98
95
87
94
June
95.0
97
97
90
98
July
95.8
94
95
96
96
August
92.5
85
92
96
97
September
86.8
81
93
79
84
October
78.5
86
68
80
73
November
58.4
57
57
74
64
December
59.3
54
79
70
42
Average
82.8
65.3
82.8
87.9
86.3
86.2
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.