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
42.3
54
35
57
36
40
February
61.9
54
61
71
73
74
March
81.7
87
84
97
78
80
April
89.2
82
89
83
97
May
93.0
97
91
83
93
June
94.2
98
92
96
92
July
91.0
94
87
98
96
August
89.3
92
95
80
89
September
86.7
96
82
82
85
October
69.2
70
70
86
59
November
40.8
58
40
38
33
December
33.7
31
28
37
34
Average
76.6
67.4
80.4
80.8
77.3
78.1
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.