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
80.5
80
85
77
February
73.4
83
74
63
March
89.5
89
90
90
April
88.7
99
79
May
97.8
99
97
June
99.1
99
99
July
98.5
100
98
98
August
99.7
99
100
100
September
91.6
97
87
91
October
85.9
84
83
92
November
69.4
72
57
80
December
75.9
75
80
74
Average
88.5
84.6
91.9
87.3
90.1
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.