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
68.9
80
78
63
68
71
February
83.6
83
86
88
73
93
March
92.0
92
98
97
96
85
April
96.4
96
95
97
100
May
95.9
97
100
99
96
June
96.5
99
98
93
98
July
98.2
100
100
92
100
August
93.8
96
98
96
100
September
83.1
98
96
94
96
October
85.9
98
80
84
90
November
77.4
89
79
64
85
December
71.4
77
59
60
77
Average
88.4
85.6
93.9
91.0
87.3
92.4
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.