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
82.8
88
83
81
79
96
February
79.7
80
86
85
75
86
March
90.4
80
100
93
98
92
April
97.0
99
98
97
99
May
97.7
96
99
96
98
June
98.5
97
98
99
97
July
99.7
100
100
100
100
August
99.5
99
100
100
99
September
98.0
99
98
99
99
October
82.9
94
83
90
84
November
80.0
95
88
72
73
December
82.4
86
76
92
79
Average
90.4
82.9
95.0
92.5
92.2
92.6
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.