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
85.7
80
87
82
93
87
February
87.5
94
77
89
96
84
March
90.7
95
97
80
81
92
April
86.0
91
85
86
88
75
May
86.2
73
87
98
89
June
82.9
75
86
79
84
July
80.2
97
75
56
90
August
84.5
91
84
64
67
September
88.2
91
88
87
88
October
94.2
96
96
93
93
November
93.0
91
96
88
94
December
90.5
91
87
86
96
Average
86.8
91.3
86.6
85.3
81.2
85.0
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.