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
79.5
97
74
91
72
68
February
80.5
55
99
72
85
82
March
77.7
94
83
80
76
61
April
80.1
75
82
91
74
May
90.2
91
100
83
91
June
97.3
99
100
99
93
July
94.4
99
81
100
98
August
98.2
96
100
95
98
September
94.8
98
92
97
88
October
90.3
100
88
79
90
November
90.0
100
90
68
93
December
72.5
63
32
95
56
Average
87.3
82.3
90.5
86.7
87.7
84.0
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.