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
95.9
96
96
94
97
90
February
92.4
84
93
96
96
92
March
89.4
83
89
93
91
85
April
91.9
94
87
94
88
May
89.3
89
83
89
90
June
85.6
80
88
94
81
July
84.0
98
79
76
75
August
91.2
97
85
87
98
September
89.1
89
89
86
88
October
86.7
88
88
90
85
November
92.7
92
94
96
95
December
94.9
90
99
95
96
Average
89.8
87.0
91.1
88.6
90.6
88.2
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.