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
76.1
78
92
69
65
59
February
65.6
65
79
54
53
67
March
74.4
72
90
61
74
72
April
85.3
90
78
87
84
May
83.0
90
75
80
79
June
74.6
95
51
69
43
July
85.8
82
77
94
87
August
93.9
94
94
88
93
September
87.3
90
89
84
86
October
88.1
99
92
86
87
November
89.5
86
87
90
94
December
76.1
77
99
80
84
Average
80.6
71.7
88.7
76.2
79.2
77.9
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.