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
63.0
68
69
75
36
72
February
75.9
72
86
84
70
85
March
83.0
65
89
91
86
90
April
93.0
94
90
93
95
May
92.9
100
98
85
92
June
96.3
99
93
98
97
July
96.7
97
98
98
96
August
90.6
85
94
92
94
September
86.1
81
89
91
83
October
72.6
68
74
63
69
November
58.6
55
44
67
66
December
57.2
45
67
67
38
Average
84.4
67.9
87.1
88.7
85.4
87.8
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.