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
54.7
57
73
58
42
51
February
65.6
61
70
69
66
64
March
85.3
90
77
84
88
93
April
93.1
94
81
94
100
May
95.6
98
97
94
99
June
97.0
95
98
96
98
July
94.8
96
91
97
96
August
97.8
97
98
100
98
September
91.7
98
77
86
99
October
80.5
79
80
90
86
November
60.4
68
50
74
45
December
45.8
54
49
48
55
Average
82.6
71.3
86.3
82.1
85.0
85.8
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.