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
70.0
67
71
58
80
61
February
70.8
72
80
82
70
67
March
88.9
94
97
98
98
83
April
95.9
99
99
95
100
May
96.9
97
100
97
100
June
97.6
99
99
92
96
July
99.8
100
100
100
100
August
99.6
100
100
100
99
September
97.2
99
99
98
99
October
85.2
86
96
94
83
November
66.1
93
89
28
39
December
48.2
75
64
14
11
Average
86.2
79.3
92.9
93.2
84.6
78.9
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.