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
74.4
80
82
69
67
76
February
83.7
84
86
83
84
84
March
86.2
94
82
95
89
82
April
93.1
91
91
91
98
May
96.9
97
98
96
99
June
96.8
97
99
98
96
July
95.3
96
98
99
92
August
95.3
97
96
94
95
September
88.3
92
80
85
97
October
83.7
82
83
93
91
November
61.5
75
68
65
71
December
66.2
71
60
67
85
Average
87.9
86.8
89.7
88.9
89.0
90.7
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.