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
76.3
73
71
76
74
70
February
83.9
84
85
79
79
75
March
89.5
91
90
83
91
83
April
94.0
99
95
88
93
94
May
93.9
93
83
99
97
June
96.1
97
97
94
95
July
90.0
91
78
89
90
August
88.5
97
84
93
86
September
89.6
94
91
93
80
October
79.1
77
79
75
72
November
68.7
75
59
52
68
December
70.0
70
58
68
68
Average
85.6
87.0
86.7
80.5
83.8
82.1
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.