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
88.6
93
83
97
84
89
February
81.5
68
96
94
90
93
March
79.9
66
85
91
97
71
April
77.4
83
84
78
75
87
May
77.5
73
86
75
82
June
91.1
90
98
94
76
July
92.0
91
99
89
88
August
93.4
89
97
93
90
September
84.8
96
83
90
84
October
84.3
83
93
92
74
November
78.1
87
84
75
98
December
81.7
84
72
88
60
Average
83.8
77.2
86.5
90.2
87.0
82.9
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.