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
52.0
58
83
56
75
25
February
63.9
61
57
94
73
62
March
71.8
84
76
65
50
84
April
86.0
85
85
91
97
May
86.7
89
93
86
79
June
91.6
99
95
82
93
July
78.5
94
87
82
66
August
82.4
89
77
80
79
September
79.4
68
91
66
83
October
71.3
80
74
75
72
November
64.2
82
53
70
60
December
70.4
65
94
86
85
Average
74.5
68.2
81.4
80.2
76.4
74.3
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.