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
53.4
67
50
46
45
59
February
71.3
62
68
69
76
77
March
83.7
81
87
91
88
85
April
90.6
83
85
90
95
May
91.6
91
98
92
98
June
93.5
99
95
84
95
July
92.8
93
99
84
93
August
93.5
90
97
88
99
September
90.4
93
88
95
92
October
78.5
83
83
85
75
November
61.8
64
70
51
70
December
49.9
48
40
43
44
Average
81.2
70.7
82.4
84.8
79.9
85.3
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.