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
72.1
67
83
66
68
73
February
75.6
60
89
72
78
67
March
84.9
82
74
92
92
87
April
92.1
88
94
98
87
May
89.7
89
95
89
92
June
89.2
93
85
86
93
July
86.9
81
97
86
81
August
87.3
79
86
92
89
September
85.6
89
89
88
88
October
78.4
86
74
83
81
November
84.2
83
87
86
83
December
72.7
79
78
59
87
Average
83.0
70.6
84.6
86.2
85.3
84.7
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.