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
64.2
71
71
69
66
February
70.0
73
77
79
75
March
69.1
77
67
77
63
April
65.9
78
85
73
80
27
May
77.1
84
74
79
83
June
78.4
69
100
81
78
July
66.3
73
100
70
79
August
65.4
69
97
73
84
September
70.6
69
100
72
89
October
71.5
67
66
72
November
63.7
69
48
62
December
62.3
66
58
76
Average
69.6
74.4
70.7
74.3
70.8
70.7
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.