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
73.5
79
60
82
February
75.5
88
60
79
March
75.1
83
85
58
April
55.1
84
31
May
80.6
86
75
June
98.8
99
99
July
98.6
99
98
August
97.4
99
96
September
98.6
98
99
October
97.7
98
98
November
93.7
97
91
December
88.7
93
81
Average
84.8
83.3
88.8
82.2
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.