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
61.1
73
63
71
54
83
February
67.9
56
76
87
70
81
March
71.8
57
84
69
82
72
April
90.1
80
97
95
93
May
92.6
88
88
99
99
June
98.0
96
99
96
99
July
98.1
99
97
96
100
August
97.9
100
100
100
96
September
91.9
86
96
81
95
October
86.2
94
83
66
89
November
65.1
83
67
67
78
December
50.1
65
14
54
18
Average
81.1
61.5
86.1
84.9
82.7
86.2
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.