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
78.7
79
65
72
79
86
February
89.0
86
79
94
93
95
March
91.7
82
92
85
88
99
April
96.2
89
97
97
98
May
98.2
99
98
100
97
June
98.7
98
100
99
99
July
98.6
98
97
98
99
August
99.5
99
99
100
100
September
99.4
99
99
100
100
October
97.8
99
95
100
99
November
89.2
73
91
88
94
December
76.8
82
96
68
68
Average
92.6
82.3
90.7
94.3
93.6
95.2
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.