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
84.4
82
64
96
86
84
February
81.2
88
69
76
85
78
March
80.4
82
75
71
87
84
April
86.7
96
86
86
81
May
88.7
81
91
99
82
June
89.5
86
89
93
80
July
91.2
87
93
94
84
August
90.5
87
91
89
88
September
87.8
85
86
90
93
October
87.8
80
92
90
87
November
83.2
82
83
85
79
December
82.5
71
95
90
79
Average
85.6
83.8
79.1
87.0
89.1
83.0
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.