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
73.6
84
74
94
82
37
February
83.0
98
92
94
68
98
March
96.3
96
99
99
100
95
April
97.7
97
96
96
100
May
96.7
93
100
97
100
June
98.6
95
99
100
98
July
99.7
100
100
100
99
August
99.2
99
98
100
99
September
97.1
99
92
97
100
October
91.0
95
78
97
84
November
73.9
89
55
81
54
December
71.0
64
68
74
62
Average
91.9
92.9
92.7
91.7
92.9
88.7
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.