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
67.8
61
75
64
67
73
February
68.7
48
76
78
78
78
March
73.5
66
55
85
79
87
April
91.9
94
88
96
96
May
89.0
91
90
83
93
June
89.4
83
84
91
96
July
89.9
86
91
90
91
August
92.6
89
87
95
95
September
84.7
79
90
84
81
October
79.6
72
67
82
89
November
69.3
68
67
79
68
December
59.5
53
53
60
58
Average
80.1
58.5
78.6
81.3
84.6
87.0
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.