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
78.3
81
73
69
70
83
February
87.9
78
88
89
90
92
March
90.4
93
83
96
88
94
April
95.9
94
95
95
100
May
94.5
92
96
98
100
June
95.7
95
97
93
97
July
95.8
92
99
90
96
August
94.5
92
97
89
98
September
95.4
96
94
98
97
October
95.1
93
94
95
98
November
84.8
80
90
73
96
December
78.9
74
66
83
87
Average
91.2
85.7
88.4
92.6
89.8
95.5
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.