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
79.5
92
83
93
85
54
February
87.4
88
92
100
66
100
March
96.9
100
100
100
93
98
April
99.1
97
100
100
100
May
98.3
99
98
98
98
June
99.5
100
100
100
98
July
99.2
100
99
98
99
August
99.1
95
100
99
100
September
97.5
100
96
100
99
October
89.7
96
75
97
88
November
76.6
85
81
84
52
December
75.7
70
75
77
64
Average
93.3
93.4
94.5
94.9
93.2
90.3
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.