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
86.3
82
95
85
72
89
February
88.7
87
90
97
92
79
March
87.0
89
87
83
90
94
April
86.9
81
84
94
99
May
84.3
89
84
87
98
June
79.1
88
80
76
79
July
78.9
79
77
89
84
August
76.3
76
73
66
77
September
78.0
82
81
77
79
October
73.5
58
77
72
83
November
86.4
76
88
88
90
December
87.8
90
84
90
76
Average
83.4
85.8
82.6
82.7
82.6
85.1
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.