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
71.0
68
71
60
64
70
February
81.0
81
97
82
83
85
March
92.2
90
95
93
100
96
April
96.6
97
95
96
99
May
94.8
90
95
97
97
June
99.0
98
99
100
99
July
99.5
99
100
100
100
August
99.4
98
98
100
100
September
97.9
100
98
98
99
October
87.7
88
94
91
90
November
72.3
90
74
71
65
December
70.3
82
56
64
67
Average
89.3
80.2
93.0
90.1
90.8
91.0
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.