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
68.0
59
64
65
64
71
February
74.1
70
70
73
74
71
March
80.2
66
80
85
85
88
April
87.3
85
90
83
86
May
91.1
97
93
82
96
June
95.3
91
95
94
96
July
94.3
86
97
97
93
August
92.3
88
95
85
94
September
86.7
82
89
91
83
October
78.2
85
69
66
78
November
64.2
55
50
75
81
December
64.0
70
66
67
56
Average
83.7
65.7
83.6
86.6
84.0
87.3
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.