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
61.6
59
58
25
77
83
February
58.8
50
46
66
91
40
March
65.4
77
60
77
69
51
April
69.7
64
78
70
71
May
74.6
69
78
66
88
June
0
0
0
0
July
94.9
86
96
97
100
August
86.6
93
92
69
92
September
74.6
66
74
78
87
October
60.9
68
53
45
69
November
61.2
70
57
62
54
December
0
0
0
0
Average
71.4
66.0
69.6
75.0
70.6
74.6
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.