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
61.0
61
55
73
67
54
February
65.8
73
71
64
73
63
March
71.6
88
74
76
80
57
April
73.2
81
55
78
83
May
78.3
78
76
93
86
June
92.3
85
99
98
97
July
93.6
92
100
98
93
August
87.1
62
90
97
96
September
83.3
82
81
92
78
October
75.3
71
74
75
79
November
66.3
60
61
67
78
December
58.3
58
53
71
68
Average
76.3
74.9
73.3
76.9
83.7
78.8
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.