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
88.2
82
91
94
92
87
February
84.8
82
90
90
88
86
March
84.5
80
83
90
87
86
April
88.2
87
91
90
89
May
89.6
93
93
90
94
June
88.3
87
88
87
95
July
86.3
86
87
92
88
August
87.9
90
93
88
86
September
86.6
85
89
91
October
89.4
85
89
96
90
November
90.1
86
92
96
91
December
88.2
88
76
92
92
Average
86.9
81.1
87.5
89.7
90.6
89.4
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.