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
51.0
41
44
52
40
37
February
83.9
69
98
93
90
73
March
97.8
97
98
100
94
97
April
97.0
98
100
88
99
May
98.9
99
100
98
100
June
92.6
87
98
89
92
July
69.7
69
68
61
94
August
55.3
56
65
36
64
September
61.4
57
72
54
57
October
84.4
94
90
79
73
November
49.5
28
77
34
40
December
43.4
42
47
37
46
Average
73.7
70.7
74.3
81.6
66.0
69.9
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.