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
82.8
76
76
81
93
57
February
79.3
59
73
81
79
70
March
94.8
88
96
93
88
98
April
93.1
90
96
95
89
May
87.5
84
85
95
91
June
68.8
54
75
81
80
July
44.1
47
51
47
47
August
41.8
35
41
46
50
September
59.7
60
53
68
56
October
79.2
83
85
83
74
November
97.3
95
95
96
99
December
89.0
81
94
91
99
Average
76.0
74.9
72.4
76.9
79.8
74.5
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.