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
68.3
76
56
83
70
82
February
76.9
83
87
85
62
93
March
88.3
79
94
99
83
95
April
92.1
88
88
81
100
May
92.3
93
97
98
95
June
97.8
99
94
99
86
July
96.8
97
99
100
98
August
95.6
94
97
84
99
September
88.8
96
82
96
89
October
83.2
86
85
95
79
November
65.6
75
68
54
65
December
62.5
60
36
37
66
Average
85.2
79.2
88.9
86.4
81.3
87.6
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.