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
88.9
87
86
91
88
92
February
88.4
89
90
90
86
94
March
86.4
86
82
90
85
93
April
82.6
76
85
82
96
May
73.8
75
67
75
71
June
81.8
85
80
81
89
July
82.4
88
88
73
82
August
85.5
87
82
88
86
September
89.3
91
89
83
87
October
90.8
95
82
100
89
November
89.8
92
88
87
December
87.9
88
90
87
Average
86.0
87.2
86.6
85.3
82.8
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.