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
88.8
87
88
90
90
86
February
84.2
92
67
92
82
91
March
90.4
91
97
95
83
April
92.0
100
95
89
86
May
92.8
96
92
94
June
95.5
92
100
96
97
July
95.7
98
99
90
96
August
97.2
99
96
94
100
September
94.0
97
96
11
99
October
90.6
95
100
18
91
November
87.8
88
85
90
90
December
87.0
88
76
83
94
Average
91.5
89.7
93.6
94.2
89.2
92.0
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.