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
80.1
87
64
88
84
73
February
85.1
87
91
82
81
80
March
89.1
83
90
89
86
89
April
95.4
95
92
96
100
May
96.7
99
100
93
97
June
98.1
99
98
98
100
July
95.5
98
95
99
98
August
93.2
88
93
87
97
September
91.1
95
89
88
93
October
90.1
92
85
96
82
November
77.8
80
77
75
86
December
74.8
75
83
74
71
Average
90.1
85.3
90.8
90.9
89.7
91.1
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.