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
68.5
70
69
73
77
85
February
70.7
61
71
66
81
65
March
84.0
78
88
81
81
87
April
92.7
95
89
91
94
May
90.4
95
87
79
93
June
0
0
0
0
July
90.0
67
95
98
79
August
86.7
84
86
89
89
September
80.4
81
80
89
78
October
65.9
85
65
64
52
November
56.1
64
52
62
63
December
64.8
75
25
43
100
Average
81.4
71.3
83.8
80.6
83.4
81.7
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.