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
89.4
92
96
92
91
78
February
74.0
75
93
90
48
46
March
79.7
89
92
78
54
56
April
86.7
97
92
89
May
84.9
100
79
68
100
June
83.1
93
90
83
67
July
92.6
94
88
91
90
August
83.9
95
93
89
100
September
85.3
79
93
93
83
October
89.8
89
91
93
57
November
92.5
96
93
93
67
December
91.5
96
97
83
94
Average
80.1
85.7
92.9
89.0
79.1
76.2
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.