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
77.3
80
93
57
85
72
February
89.1
91
88
91
90
93
March
94.3
96
96
97
99
94
April
97.9
98
97
100
100
May
96.4
99
100
94
95
June
97.5
98
96
99
97
July
98.2
99
100
92
99
August
98.1
96
100
97
99
September
96.5
99
97
95
94
October
86.7
95
83
89
90
November
76.8
90
72
72
75
December
71.0
74
72
68
70
Average
91.6
89.7
94.8
91.2
91.5
91.8
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.