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
79.3
88
75
90
80
89
February
83.6
87
91
100
72
94
March
90.4
87
99
96
84
92
April
94.3
83
97
96
99
May
98.3
100
99
99
99
June
97.2
98
100
97
96
July
98.8
100
100
98
100
August
98.3
100
98
96
100
September
97.9
98
98
100
97
October
92.7
99
98
99
87
November
79.4
93
68
94
74
December
68.6
83
69
68
51
Average
91.1
87.5
94.1
94.6
91.8
91.7
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.