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
46.6
50
39
45
36
53
February
64.5
56
66
75
63
76
March
79.6
79
74
97
81
77
April
89.8
80
78
84
99
May
91.7
99
95
91
85
June
93.3
96
95
95
88
July
90.2
92
88
99
96
August
91.8
90
99
86
93
September
83.4
89
70
69
92
October
69.9
63
64
83
57
November
49.7
68
43
60
53
December
43.3
31
56
53
40
Average
75.3
62.4
76.0
76.9
77.3
78.1
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.