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
62.9
71
59
54
65
53
February
75.2
65
76
69
77
81
March
87.7
85
86
92
93
90
April
94.7
94
93
93
98
May
95.9
95
99
93
100
June
96.3
98
96
93
97
July
94.6
92
99
84
99
August
93.6
86
98
92
99
September
91.0
88
88
90
94
October
78.7
78
72
82
80
November
67.1
65
72
57
69
December
56.3
52
59
44
50
Average
81.3
74.2
82.9
85.9
83.3
87.7
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.