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
82
79
75
77
67
February
81.8
73
76
89
80
91
March
87.4
84
80
97
92
92
April
90.5
80
92
93
97
May
93.3
89
91
94
99
June
93.8
97
92
90
96
July
92.7
88
97
87
92
August
92.9
85
96
92
94
September
90.4
85
89
94
92
October
88.5
83
92
87
91
November
78.9
75
86
71
78
December
71.2
73
69
68
77
Average
87.3
79.3
83.1
89.9
87.1
90.4
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.