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
69.5
84
80
69
58
79
February
79.8
98
91
83
68
93
March
91.2
96
99
94
80
95
April
87.8
98
96
88
78
100
May
92.9
100
92
79
100
June
92.9
94
97
91
96
July
53.3
74
25
68
57
August
42.2
80
44
58
25
September
64.9
88
88
44
78
October
86.0
99
93
87
98
November
77.2
83
98
58
94
December
72.1
79
95
58
87
Average
76.6
94.0
89.2
79.0
68.3
83.4
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.