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
76.2
89
91
92
91
85
February
72.3
75
82
88
81
91
March
80.7
73
73
81
82
95
April
87.6
82
86
89
98
96
May
74.2
61
87
66
88
June
81.1
83
86
82
82
July
86.1
95
90
87
90
August
89.4
94
88
96
83
September
82.0
82
88
83
84
October
86.2
86
84
87
89
November
85.7
89
90
86
82
December
76.9
91
93
85
87
Average
81.8
79.2
83.7
87.4
85.0
87.6
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.