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
January
88.4
88
69
100
February
75.7
65
75
85
March
81.3
71
76
88
89
April
78.2
72
72
88
May
82.6
93
60
95
June
97.3
100
90
100
July
71.0
54
79
80
August
83.0
85
69
93
September
82.9
86
69
93
October
69.3
82
52
69
November
66.4
88
37
77
December
85.9
76
100
88
Average
77.5
71.8
78.9
72.7
86.6
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.