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
69.6
70
70
78
69
70
February
80.8
68
94
73
81
79
March
89.1
91
93
94
95
87
April
91.8
92
84
96
92
May
90.6
94
95
84
92
June
91.7
93
90
91
92
July
96.1
96
99
88
99
August
94.4
93
96
90
96
September
90.2
94
93
88
90
October
86.6
88
91
91
77
November
80.1
71
78
85
96
December
68.4
60
88
78
63
Average
86.0
77.3
87.9
89.3
86.8
87.6
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.