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
71.9
80
74
68
59
79
February
84.9
77
81
90
87
92
March
90.1
94
88
96
90
92
April
92.8
88
96
93
98
May
92.9
88
96
97
99
June
93.9
97
99
85
97
July
94.4
97
98
88
93
August
93.0
91
94
87
98
September
93.9
96
93
95
95
October
93.5
96
97
93
95
November
84.9
92
91
74
91
December
74.3
80
60
64
86
Average
89.1
84.6
89.9
92.5
86.0
93.8
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.