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
88.5
90
86
93
83
88
February
84.5
76
87
77
86
89
March
84.3
85
75
80
84
86
April
86.9
91
87
85
84
May
85.5
92
80
85
79
June
85.2
84
87
82
84
July
88.3
92
89
83
93
August
93.4
96
88
94
96
September
95.5
95
96
94
94
October
92.0
92
96
91
95
November
90.6
87
92
93
92
December
87.5
84
90
84
86
Average
88.1
84.2
88.3
87.8
87.1
88.5
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.