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
2021
2020
January
82.7
78
80
97
90
96
February
60.1
80
58
85
82
March
76.7
64
73
85
83
93
April
82.8
78
94
72
87
May
88.5
72
95
79
96
June
94.5
97
95
100
97
July
96.6
99
98
100
98
August
95.4
97
97
98
September
95.2
98
98
95
94
October
94.8
97
97
98
94
November
93.0
94
95
99
100
December
82.2
90
58
91
96
Average
85.9
73.5
86.0
93.4
86.8
93.9
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.