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
90.0
92
95
90
89
88
February
84.9
86
89
80
85
90
March
83.4
85
82
83
92
77
April
82.0
86
77
84
80
May
80.8
90
78
81
76
June
82.8
86
87
85
82
July
80.4
85
82
80
81
August
89.3
88
91
88
96
September
89.2
93
94
89
86
October
88.3
91
94
93
89
November
91.0
88
93
92
94
December
91.3
88
94
88
90
Average
86.3
87.6
88.2
86.8
87.1
85.5
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.