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
53.1
64
41
45
74
31
February
72.3
65
67
69
83
49
March
99.3
100
100
100
98
100
April
97.8
99
97
95
99
May
96.5
97
96
99
97
June
95.1
94
97
94
93
July
96.4
94
97
98
98
August
97.8
94
97
98
99
September
93.4
89
90
93
96
October
96.3
95
99
99
99
November
95.6
96
98
98
100
December
68.0
50
86
72
83
Average
87.5
77.1
85.3
90.0
92.0
87.5
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.