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
68.0
71
69
60
61
76
February
86.9
86
78
97
71
96
March
93.1
94
95
96
92
94
April
93.8
89
86
97
99
May
96.1
99
98
98
96
June
96.1
99
99
94
91
July
97.2
99
97
93
99
August
96.8
94
98
95
98
September
94.1
97
92
96
92
October
86.1
95
83
82
85
November
70.0
88
66
58
65
December
66.6
78
54
51
52
Average
85.8
84.4
91.3
87.7
86.1
89.3
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.