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
75.6
72
78
80
94
36
February
68.9
76
72
58
80
63
March
85.2
85
99
73
72
91
April
93.0
100
99
95
77
May
98.2
98
99
96
99
June
99.6
100
99
100
100
July
98.7
99
99
99
99
August
98.9
99
99
99
99
September
98.5
98
97
99
99
October
97.5
99
98
99
93
November
95.1
99
96
99
86
December
85.0
76
81
89
97
Average
89.6
77.7
93.1
90.4
93.5
87.2
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.