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
85.6
94
77
89
74
93
February
88.7
88
84
88
85
91
March
86.4
92
85
74
79
85
April
87.9
89
81
94
86
May
89.5
87
84
91
99
June
0
0
0
0
July
60.8
28
60
100
53
August
86.8
86
92
88
91
September
90.2
90
78
99
95
October
93.0
89
94
87
91
November
89.0
90
93
83
96
December
0
0
0
0
Average
88.8
90.4
86.2
84.3
88.3
89.6
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.