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
81.9
85
87
97
76
74
February
84.1
86
88
90
86
80
March
87.8
89
95
90
80
95
April
99.3
98
100
100
99
May
97.5
100
94
96
100
June
84.3
91
82
88
90
July
76.9
81
87
73
73
August
87.9
97
90
94
80
September
88.5
93
94
91
81
October
74.1
54
97
90
62
November
83.3
75
88
93
87
December
85.1
91
91
83
87
Average
84.7
86.5
86.2
91.6
87.3
82.6
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.