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
81.0
91
86
83
89
62
February
83.1
81
82
91
80
90
March
89.7
90
83
96
91
91
April
94.2
86
97
96
98
May
94.4
93
98
95
100
June
94.6
99
97
87
96
July
94.4
93
98
89
94
August
96.8
96
98
96
97
September
93.8
93
97
94
92
October
91.5
87
94
92
92
November
85.3
86
89
82
83
December
75.7
73
86
65
81
Average
90.5
87.6
89.3
94.9
89.4
91.5
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.