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
70.5
68
69
79
70
70
February
70.5
55
75
90
63
85
March
75.8
66
72
88
80
71
April
90.8
89
94
97
94
May
89.7
96
92
86
94
June
91.3
96
95
83
95
July
93.6
94
92
97
90
August
91.6
86
92
97
91
September
87.7
80
91
88
88
October
78.4
87
70
70
81
November
69.1
59
68
76
67
December
68.2
82
92
73
51
Average
82.1
62.6
84.9
88.7
84.4
84.9
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.