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
87.2
90
88
79
89
86
February
80.7
73
84
91
86
85
March
82.4
80
75
91
85
99
April
90.7
88
96
98
95
May
79.2
66
92
71
91
June
87.7
89
84
89
95
July
87.1
95
60
91
92
August
90.1
97
60
98
91
September
92.1
90
97
93
82
October
89.6
83
94
90
93
November
90.2
88
94
98
79
December
89.1
92
94
78
88
Average
86.2
80.3
86.1
84.1
88.8
90.4
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.