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
61.6
62
78
46
83
50
February
69.6
64
71
57
77
89
March
79.3
83
88
81
68
86
April
85.4
95
90
78
93
May
85.3
89
86
87
87
June
84.7
91
95
82
85
July
92.1
98
100
89
76
August
95.8
97
100
90
96
September
85.2
90
79
96
82
October
89.9
94
91
85
97
November
81.5
96
72
88
85
December
69.5
76
74
80
72
Average
80.7
70.2
88.8
81.9
83.4
83.1
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.