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
80.8
91
92
76
81
85
February
86.0
98
87
81
86
92
March
89.5
96
96
84
86
91
April
94.1
94
95
92
96
May
91.7
97
83
97
89
June
92.8
91
95
85
99
July
93.2
89
97
89
99
August
87.8
88
97
81
89
September
95.2
86
99
98
99
October
92.7
91
94
96
97
November
86.1
98
83
95
91
December
88.6
95
96
88
83
Average
90.3
94.6
91.8
89.9
89.5
92.4
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.