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
87.7
89
94
88
91
79
February
84.1
79
84
95
75
89
March
86.4
89
82
84
86
95
April
89.6
82
97
98
96
May
85.4
75
96
84
98
June
88.5
98
96
85
85
July
93.9
93
97
88
96
August
96.6
98
96
97
96
September
94.4
97
98
97
89
October
93.8
96
95
97
96
November
90.5
97
92
90
91
December
85.3
87
94
79
85
Average
89.6
86.0
90.0
94.3
89.2
92.1
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.