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
64.4
65
71
63
67
64
February
72.8
56
78
77
91
84
March
79.9
76
78
96
70
87
April
92.2
93
93
94
98
May
91.0
96
87
91
85
June
92.3
91
91
97
90
July
93.5
97
98
99
97
August
95.6
91
98
94
96
September
94.8
96
98
98
96
October
86.7
89
83
84
87
November
72.3
90
65
74
72
December
69.6
75
45
65
68
Average
84.2
66.7
88.9
87.4
87.3
87.7
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.