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
70.2
64
88
62
71
60
February
62.5
75
64
54
53
61
March
80.2
71
88
67
88
96
April
96.8
99
97
95
98
May
98.4
98
96
100
99
June
99.2
100
100
98
100
July
98.6
93
100
99
100
August
99.6
100
100
100
99
September
98.1
100
94
98
98
October
92.4
86
90
98
96
November
78.0
75
71
86
85
December
66.7
58
98
65
77
Average
87.2
70.1
89.6
87.1
90.4
91.6
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.