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
82.7
87
87
82
81
79
February
81.8
68
82
80
93
81
March
85.9
89
90
91
94
83
April
90.5
84
93
100
90
May
87.8
90
91
93
90
June
85.3
83
95
77
91
July
87.1
86
94
80
77
August
87.2
83
86
87
90
September
89.7
96
91
90
91
October
86.1
88
88
89
89
November
90.7
88
96
95
90
December
82.8
89
95
73
88
Average
86.2
81.8
86.9
90.3
87.5
86.6
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.