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
62.8
62
70
61
65
41
February
71.3
82
77
52
75
61
March
82.9
85
79
89
84
89
April
90.0
100
80
87
91
May
96.9
99
94
98
97
June
96.6
99
93
100
96
July
95.7
94
99
98
95
August
94.5
97
99
99
90
September
90.6
97
87
88
96
October
83.2
73
79
90
94
November
64.8
60
46
70
72
December
61.8
57
82
64
68
Average
84.8
77.6
87.3
84.1
88.3
86.1
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.