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
84.7
96
89
92
96
96
February
85.1
89
94
94
94
94
March
81.0
89
85
87
91
87
April
74.5
77
83
66
77
May
74.1
62
86
81
85
June
73.7
77
74
83
59
July
75.1
80
70
46
75
August
70.2
73
75
100
70
September
82.9
90
85
67
90
October
78.2
67
86
100
89
November
75.9
62
81
91
December
84.1
94
88
100
93
Average
80.7
91.5
79.6
84.0
85.3
85.1
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.