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
91.6
98
84
82
95
88
February
92.0
99
86
82
94
86
March
92.2
93
98
87
95
96
April
82.6
99
54
70
89
May
85.7
94
79
64
100
June
89.2
95
79
79
July
86.1
96
66
82
August
81.3
96
60
77
September
77.8
96
71
53
October
77.7
93
76
49
76
November
92.5
97
88
90
88
December
92.1
97
94
85
93
Average
88.0
96.5
94.3
75.9
76.8
89.2
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.