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
54.4
62
53
55
55
46
February
70.1
60
70
75
79
78
March
72.7
65
69
85
75
87
April
92.6
94
90
96
96
May
93.2
98
96
93
94
June
95.6
96
97
100
92
July
94.8
97
95
91
96
August
95.7
93
95
96
98
September
90.4
92
97
88
88
October
80.9
75
76
85
89
November
68.9
79
70
77
64
December
57.4
58
62
49
61
Average
81.9
62.6
85.0
86.8
85.5
86.4
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.