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
77.0
78
87
48
81
74
February
86.4
81
93
90
90
82
March
95.4
97
97
95
96
92
April
94.5
93
89
97
94
May
94.5
97
96
95
94
June
95.1
94
94
93
98
July
97.7
96
99
96
98
August
97.5
98
99
95
99
September
94.2
96
97
91
95
October
87.0
96
92
83
86
November
81.0
85
83
76
84
December
72.4
69
64
64
83
Average
90.3
86.3
92.7
89.7
89.4
91.1
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.