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
38.2
58
33
34
33
36
February
59.5
50
52
54
71
60
March
73.3
64
91
79
77
April
83.9
68
83
79
97
May
86.2
84
96
83
95
June
92.0
97
93
87
88
July
88.6
87
92
79
90
August
86.7
80
93
71
95
September
83.8
91
78
85
90
October
62.8
63
76
65
52
November
44.7
40
57
41
59
December
31.2
31
42
31
20
Average
70.6
53.8
70.5
79.4
69.7
73.7
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.