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
63.7
66
79
60
69
32
February
78.8
75
83
77
85
75
March
91.4
96
88
94
92
83
April
91.3
88
90
93
87
May
98.1
97
99
100
99
June
97.6
99
99
98
97
July
97.1
97
99
98
97
August
97.6
97
99
97
97
September
97.9
99
97
96
96
October
94.9
94
88
97
98
November
83.0
69
86
71
85
December
83.3
78
99
91
88
Average
89.1
79.5
89.7
91.1
91.3
87.1
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.