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
January
84.8
86
83
84
February
79.7
72
90
86
March
89.6
90
90
April
92.6
90
98
97
May
86.7
82
93
89
June
91.8
95
95
82
July
91.9
95
91
88
August
96.4
98
93
96
September
93.3
96
91
93
October
87.7
91
87
80
November
84.9
88
84
79
December
64.3
68
52
57
Average
85.9
79.2
89.2
90.4
84.7
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.