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
74.7
83
81
71
76
71
February
74.7
61
82
78
85
85
March
81.0
78
84
85
82
88
April
91.4
99
94
79
97
May
92.5
97
96
93
93
June
93.7
94
95
95
95
July
95.1
96
98
96
91
August
94.4
95
94
95
94
September
89.8
93
91
92
89
October
86.1
76
89
90
91
November
75.7
85
80
79
72
December
71.2
70
73
54
69
Average
85.8
73.9
89.5
89.4
86.9
88.7
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.