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
65.8
59
95
52
54
77
February
74.6
75
83
74
72
76
March
85.6
88
88
84
86
93
April
93.4
98
82
96
96
May
96.7
98
99
94
97
June
97.0
96
99
95
96
July
98.0
95
99
99
100
August
98.4
97
98
99
100
September
93.1
95
80
93
100
October
89.8
84
86
94
96
November
69.0
70
55
74
61
December
55.7
59
58
59
66
Average
83.3
75.7
90.3
85.2
87.8
90.7
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.