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
76.9
83
80
89
63
75
February
79.5
87
86
75
76
76
March
89.3
88
88
86
93
91
April
92.1
99
88
94
87
May
87.7
96
87
67
88
June
0
0
0
0
July
86.6
53
93
95
88
August
87.1
85
95
88
89
September
85.6
83
82
93
89
October
75.6
88
85
73
66
November
64.4
73
56
65
82
December
68.1
67
67
33
67
Average
85.3
87.0
86.0
85.9
83.7
84.9
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.