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
60.8
44
52
58
53
67
February
78.7
74
73
69
79
87
March
87.9
77
80
93
88
93
April
94.0
96
81
96
100
May
96.7
96
91
96
100
June
90.7
84
90
87
98
July
59.6
47
50
72
78
August
68.4
82
61
81
48
September
64.4
63
64
41
72
October
78.2
70
73
73
87
November
71.7
66
75
68
73
December
60.8
47
53
48
69
Average
75.1
65.2
71.9
72.1
73.4
79.4
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.