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
79.6
73
85
82
88
73
February
80.7
84
82
92
66
82
March
88.5
88
92
89
83
93
April
96.1
100
99
99
98
May
98.0
100
99
98
99
June
97.7
98
98
97
98
July
96.7
98
97
95
100
August
94.1
94
96
90
95
September
94.7
97
92
97
95
October
87.4
91
89
90
85
November
74.5
62
73
82
87
December
72.5
76
87
87
77
Average
89.7
82.7
91.9
92.8
90.8
92.3
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.