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
81.2
100
61
96
100
60
February
80.5
100
76
88
100
57
March
71.7
97
67
97
99
79
April
73.5
100
100
90
100
85
May
71.6
100
71
100
99
June
77.8
100
100
100
97
July
80.6
100
49
100
100
August
86.5
100
92
100
98
September
81.0
100
95
100
97
October
68.5
89
55
96
97
November
72.3
100
54
98
100
December
77.4
100
46
98
100
Average
86.2
99.2
93.3
75.3
99.1
84.6
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.