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
81.2
90
88
76
73
88
February
76.5
92
62
79
71
76
March
87.0
85
90
79
89
90
April
94.5
99
95
95
96
May
96.7
94
92
98
98
June
97.8
96
93
98
100
July
96.7
96
98
100
95
August
97.1
98
95
97
96
September
92.7
90
80
95
100
October
92.6
90
93
97
97
November
84.0
69
78
87
83
December
81.1
83
88
87
85
Average
90.9
88.6
90.0
88.6
92.3
93.3
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.