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
47.9
59
36
48
47
35
February
60.2
47
61
66
75
62
March
66.2
69
57
85
61
74
April
88.1
94
87
94
91
May
89.0
98
89
85
88
June
92.0
93
91
93
96
July
93.3
92
92
96
90
August
88.0
75
91
91
94
September
83.7
78
93
84
79
October
71.8
74
61
62
77
November
56.7
66
58
70
51
December
49.5
46
63
63
46
Average
76.5
59.2
77.7
81.7
80.8
79.1
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.