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
92.9
98
90
90
92
98
February
89.9
86
87
93
94
91
March
90.8
87
95
87
89
93
April
91.4
87
90
95
94
May
90.3
90
88
85
98
June
85.8
86
79
87
89
July
83.3
83
79
77
88
August
91.0
93
88
88
90
September
91.6
96
74
97
93
October
93.6
95
89
99
86
November
93.2
95
93
94
92
December
92.1
91
87
90
88
Average
90.2
89.8
90.4
85.9
90.1
91.6
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.