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
65.4
68
77
67
56
66
February
74.6
65
60
81
78
88
March
82.9
90
83
74
87
95
April
94.0
100
98
95
93
May
99.3
99
99
99
100
June
99.9
100
100
100
100
July
99.8
100
100
100
100
August
99.9
100
100
100
100
September
99.4
99
100
100
100
October
96.3
93
94
93
100
November
80.9
83
81
86
82
December
62.5
72
67
65
39
Average
88.2
75.3
90.5
90.5
90.2
90.6
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.