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
62.6
61
52
69
66
70
February
62.2
53
55
65
77
57
March
75.9
58
85
78
81
77
April
85.7
73
90
87
85
91
May
88.7
92
89
78
94
June
94.1
94
95
100
100
July
92.2
89
88
96
90
August
86.4
84
86
85
89
September
72.8
54
75
89
77
October
54.0
70
57
40
35
November
42.4
55
28
51
40
December
45.9
63
54
71
30
Average
76.5
63.0
78.2
78.2
79.2
77.9
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.