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
76.2
85
90
73
73
90
February
74.2
86
80
67
78
80
March
74.4
80
80
66
67
91
April
73.5
84
65
75
86
May
73.4
84
59
95
88
June
51.3
85
64
54
40
July
50.9
69
77
50
70
August
58.3
58
85
50
64
September
67.4
77
66
52
87
October
70.2
63
75
77
90
November
87.0
94
79
88
79
December
89.0
86
95
92
89
Average
70.9
83.6
78.6
71.6
69.8
78.5
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.