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
93.9
86
86
95
97
99
February
90.5
90
68
94
91
100
March
90.5
88
83
95
91
93
April
77.9
71
84
80
93
May
52.8
39
30
58
65
June
58.7
45
55
49
79
July
61.0
52
58
50
77
August
68.1
62
54
0
83
September
81.7
80
75
82
October
87.3
77
76
95
November
87.1
76
72
91
December
93.0
85
85
97
Average
82.4
87.5
70.3
72.8
79.6
88.9
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.