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
63.8
66
56
66
66
76
February
71.0
60
75
79
84
74
March
77.8
68
77
89
76
85
April
90.8
81
92
93
93
97
May
93.2
99
89
90
93
June
94.5
99
93
95
97
July
94.7
95
98
98
93
August
94.2
88
95
91
98
September
93.2
90
99
92
92
October
84.4
87
80
86
89
November
77.5
85
79
81
81
December
69.5
78
62
75
66
Average
85.2
70.1
88.0
88.7
88.1
89.5
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.