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
79.5
86
80
65
77
77
February
88.8
91
85
90
82
90
March
88.9
87
89
85
87
88
April
95.5
94
97
95
100
May
94.8
88
98
96
97
June
95.4
94
98
93
93
July
99.0
98
100
97
100
August
98.6
99
98
100
100
September
96.8
99
97
96
98
October
85.9
89
93
87
89
November
82.8
86
83
81
82
December
82.3
69
83
88
87
Average
91.2
88.1
90.1
91.9
90.9
92.7
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.