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
January
97.8
98
98
98
February
90.5
96
78
98
March
98.5
100
100
95
April
85.2
83
88
May
58.5
67
51
June
64.3
65
63
July
71.9
74
70
August
68.8
73
65
September
77.7
82
74
October
87.8
82
94
November
91.3
89
94
December
94.1
91
100
Average
90.8
97.9
82.9
82.6
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.