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
62.4
79
60
61
59
61
February
68.5
54
59
69
78
78
March
76.8
64
72
92
74
77
April
88.8
92
90
88
May
93.2
97
91
87
100
June
93.9
99
95
95
95
July
96.1
97
97
97
98
August
94.0
88
97
89
99
September
89.7
78
97
86
89
October
79.7
86
76
82
76
November
67.5
72
59
82
77
December
66.1
70
56
83
54
Average
82.2
63.5
85.0
87.4
85.6
84.5
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.