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
82.8
81
84
72
88
91
February
84.7
88
80
82
89
89
March
84.9
87
95
70
76
94
April
76.3
69
75
86
73
May
77.7
64
81
89
85
June
74.8
63
78
71
81
July
74.6
94
72
52
84
August
77.7
81
77
54
68
September
80.0
84
76
78
81
October
87.8
86
88
80
92
November
89.7
92
90
82
89
December
85.8
92
92
77
91
Average
81.2
85.6
80.7
78.3
75.7
83.5
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.