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
79.4
72
76
88
85
61
February
77.4
72
79
83
75
75
March
80.9
78
73
77
82
91
April
94.3
94
99
96
98
May
99.0
100
99
100
100
June
98.3
99
100
98
100
July
98.5
100
98
99
98
August
98.0
98
98
98
99
September
96.4
87
100
98
99
October
92.7
89
92
97
94
November
83.9
84
82
80
90
December
80.6
79
94
79
86
Average
89.5
74.4
89.6
93.3
92.1
92.6
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.