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
89.3
97
94
85
88
93
February
88.2
100
99
83
89
81
March
89.2
95
95
88
87
91
April
90.5
88
84
87
97
May
88.7
92
83
91
90
June
74.3
89
75
52
83
July
71.0
63
80
65
95
August
71.2
73
64
62
87
September
67.9
62
68
71
84
October
83.1
76
69
86
90
November
96.1
96
98
95
96
December
95.3
97
100
91
97
Average
84.5
96.8
84.5
80.2
79.3
90.0
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.