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
77.9
84
80
78
88
61
February
79.0
65
82
83
74
87
March
83.2
79
75
83
83
95
April
89.5
80
91
99
95
May
85.8
74
92
88
94
June
88.0
89
91
80
89
July
90.5
83
91
88
91
August
96.1
96
97
95
95
September
91.0
88
95
94
88
October
88.2
84
88
89
93
November
82.3
89
79
86
79
December
72.3
74
86
54
72
Average
85.6
76.0
83.2
88.6
86.2
88.2
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.