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
80.9
84
62
81
81
81
February
87.4
80
89
97
93
91
March
92.4
91
90
83
95
97
April
93.4
91
93
97
94
May
95.0
94
88
99
98
June
96.0
91
98
98
98
July
94.3
89
88
95
100
August
96.6
94
98
99
96
September
97.3
96
97
98
100
October
94.9
90
97
96
97
November
87.5
80
93
80
89
December
80.0
81
68
89
62
Average
91.2
85.3
87.9
90.6
94.0
92.8
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.