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
73.1
78
82
69
69
61
February
85.8
94
65
92
72
95
March
92.0
87
94
97
97
April
93.4
88
86
97
98
May
85.3
92
32
99
98
June
95.4
99
91
96
91
July
97.3
99
97
93
98
August
96.2
95
96
97
94
September
92.9
93
91
95
97
October
83.4
95
78
77
81
November
64.9
89
59
58
54
December
66.9
75
64
56
57
Average
86.3
85.5
89.6
79.4
86.8
88.0
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.