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
86.6
75
97
79
89
90
February
84.7
80
75
78
92
88
March
87.4
80
79
84
90
92
April
90.9
76
87
95
95
97
May
86.3
90
81
88
84
June
80.3
74
78
85
82
July
73.5
83
82
75
70
August
82.5
83
82
82
85
September
92.4
94
86
94
91
October
95.1
99
95
96
97
November
95.9
95
94
99
95
December
93.3
90
91
94
96
Average
86.2
77.7
86.4
84.7
89.1
88.1
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.