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
55.9
58
57
55
52
62
February
66.2
56
65
69
71
79
March
83.0
82
79
91
75
88
April
90.9
90
91
94
93
May
96.1
100
97
89
98
June
95.4
97
98
99
89
July
94.9
95
97
98
98
August
91.7
85
91
87
97
September
89.4
90
95
87
87
October
79.1
84
76
89
83
November
57.0
59
44
55
69
December
48.8
52
41
57
39
Average
82.3
67.7
84.2
85.4
84.2
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.