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
65.8
85
87
70
86
52
February
48.2
66
19
0
79
86
March
59.8
72
0
49
78
84
April
76.8
30
94
78
80
May
66.5
76
95
67
69
June
72.8
86
87
77
83
July
68.3
90
88
90
92
August
73.9
95
96
97
97
September
73.8
92
91
93
88
October
71.9
73
89
83
89
November
60.6
71
73
85
82
December
52.9
39
88
60
71
Average
67.8
73.5
66.2
79.7
81.3
82.2
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.