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
74.3
72
83
75
69
71
February
77.9
60
93
77
81
67
March
83.6
82
70
91
91
86
April
89.8
86
90
98
86
May
85.9
82
91
91
90
June
81.6
83
82
79
85
July
83.0
82
90
82
76
August
83.2
78
84
89
83
September
80.6
85
84
84
79
October
77.4
82
79
83
80
November
84.3
77
92
87
82
December
75.2
77
82
65
86
Average
81.0
72.3
81.3
85.4
84.2
81.5
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.