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
81.8
89
83
84
89
63
February
80.6
72
82
89
70
88
March
85.1
85
78
89
84
95
April
88.6
79
89
98
98
May
89.5
80
95
91
98
June
90.4
93
95
84
94
July
92.1
90
94
87
89
August
96.1
96
96
96
96
September
93.3
94
98
92
90
October
89.7
84
90
87
91
November
83.7
89
81
85
84
December
74.2
75
85
66
71
Average
87.6
81.8
85.9
91.2
86.9
89.9
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.