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
62.1
82
57
65
50
66
February
77.1
64
80
86
68
91
March
88.3
81
85
95
84
93
April
95.3
89
95
94
100
May
95.8
98
99
97
97
June
96.2
98
94
100
90
July
95.1
98
98
89
98
August
95.2
91
95
97
95
September
90.4
96
90
94
86
October
82.8
76
84
91
84
November
60.9
75
52
52
60
December
56.7
52
50
48
55
Average
85.2
75.7
86.3
88.0
84.7
87.6
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.