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
80.7
79
79
91
72
69
February
79.8
66
90
84
77
85
March
79.4
71
66
91
84
87
April
87.1
81
94
99
90
May
88.5
89
90
87
93
June
87.6
82
92
85
85
July
88.0
83
90
90
79
August
84.0
81
90
90
77
September
84.1
82
88
83
86
October
81.6
71
83
68
96
November
82.5
93
89
79
66
December
77.6
84
86
68
80
Average
82.6
71.1
81.6
89.2
83.0
83.5
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.