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
69.4
87
85
73
29
66
February
74.8
93
85
93
29
100
March
84.8
94
88
94
69
64
April
87.7
98
96
44
54
May
84.5
85
89
94
86
June
98.0
97
99
100
94
July
99.4
100
100
80
99
August
97.8
100
99
58
93
September
94.1
98
97
77
92
October
88.2
100
98
63
94
November
70.5
96
86
30
43
December
74.7
96
72
63
55
Average
76.2
91.3
94.3
93.7
53.1
73.3
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.