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
80.4
84
87
84
87
66
February
78.6
72
83
77
79
78
March
82.3
77
79
84
85
87
April
89.2
82
94
97
96
May
86.7
75
96
77
97
June
88.2
94
95
80
84
July
92.8
92
94
87
90
August
96.2
96
95
97
96
September
93.6
97
99
90
90
October
89.3
85
93
88
90
November
82.7
91
76
85
82
December
73.9
74
93
62
73
Average
86.2
77.0
86.6
91.2
85.3
87.5
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.