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
76.1
87
74
85
44
96
February
74.1
75
89
87
48
87
March
79.5
70
98
93
91
68
April
78.5
93
92
53
56
May
78.3
78
96
58
71
June
89.6
92
98
96
61
July
92.4
93
100
79
96
August
91.9
90
99
84
91
September
88.3
89
93
79
84
October
70.8
83
77
75
53
November
65.0
85
83
55
72
December
76.0
85
81
93
67
Average
76.4
76.2
87.7
91.6
70.8
75.1
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.