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
65.2
77
66
86
55
76
February
76.1
74
77
81
71
82
March
84.5
77
88
88
90
74
April
93.6
89
97
99
93
May
97.0
96
99
98
98
June
99.3
99
100
99
100
July
99.1
99
99
99
99
August
99.4
100
100
100
100
September
95.4
89
99
96
94
October
89.7
95
94
90
93
November
73.4
79
84
75
88
December
60.7
70
54
71
44
Average
86.6
76.2
89.1
92.6
89.1
88.7
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.