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
66.3
79
67
60
67
67
February
79.3
73
77
88
71
88
March
90.7
90
92
94
95
93
April
94.7
96
94
89
93
100
May
96.9
96
99
99
99
June
97.0
97
99
95
93
July
97.4
99
97
95
99
August
96.1
95
98
89
96
September
94.2
99
92
94
97
October
85.2
89
90
84
81
November
59.1
79
58
49
62
December
63.5
69
64
54
51
Average
87.7
85.7
90.0
89.0
85.3
88.3
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.