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
77.1
75
81
83
82
70
February
75.0
78
82
79
76
84
March
80.5
85
77
93
81
79
April
86.1
92
85
83
87
May
92.7
95
99
88
86
June
96.2
94
94
100
100
July
94.1
91
93
98
92
August
96.2
93
94
97
99
September
95.4
96
94
91
99
October
87.6
94
92
72
88
November
80.3
89
72
90
78
December
75.2
86
62
58
77
Average
87.9
80.3
90.4
90.6
88.4
89.5
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.