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
56.2
47
52
54
76
20
February
71.8
67
64
66
73
64
March
95.7
94
96
96
96
95
April
99.5
99
99
100
100
May
99.8
100
100
100
100
June
99.8
100
100
100
100
July
98.0
99
100
99
100
August
96.0
100
100
81
98
September
97.5
96
99
99
93
October
95.5
98
98
98
99
November
90.5
93
97
88
96
December
64.7
65
84
69
74
Average
88.5
71.4
90.6
93.0
91.3
89.1
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.