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
74.9
79
89
75
85
55
February
70.8
78
61
81
72
68
March
74.7
75
90
62
70
70
April
86.0
83
77
93
97
91
May
95.9
94
95
98
95
June
97.6
98
98
98
98
July
98.1
100
96
98
97
August
97.6
99
94
99
97
September
98.6
98
99
99
97
October
91.4
72
97
97
92
November
93.9
86
98
95
100
December
85.5
90
95
83
94
Average
87.7
79.0
88.1
89.4
91.3
88.1
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.