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
85
62
60
48
73
February
78.5
67
84
88
68
92
March
88.6
85
83
95
85
94
April
94.4
87
96
92
100
May
94.3
95
100
94
96
June
96.0
98
95
99
91
July
94.7
97
99
92
97
August
94.7
91
92
92
97
September
92.1
98
91
93
95
October
83.5
74
87
91
83
November
65.7
81
60
54
70
December
58.8
65
44
47
59
Average
86.0
79.3
87.1
88.4
83.6
89.7
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.