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
80.8
65
78
86
84
80
February
74.4
47
83
76
74
81
March
76.4
56
77
82
91
76
April
78.7
73
79
85
77
70
May
81.1
72
88
83
83
June
89.4
85
89
93
88
July
90.3
86
99
80
97
August
90.6
90
93
87
90
September
86.1
77
83
81
92
October
77.7
75
75
85
79
November
70.0
55
74
73
81
December
67.3
21
62
80
71
Average
79.2
60.7
73.7
84.6
82.7
83.0
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.