Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
January
76.3
74
74
80
February
80.2
86
74
81
March
76.6
68
76
81
April
81.9
71
91
May
83.3
83
83
June
91.2
87
93
July
94.4
94
95
August
97.3
97
98
September
94.4
99
89
October
89.2
87
91
November
74.4
79
72
December
78.2
83
73
Average
82.1
76.3
83.8
86.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.