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
74.5
80
80
85
92
86
February
75.1
81
93
92
86
91
March
74.4
83
85
90
83
93
April
73.5
91
86
96
82
May
65.7
70
80
76
90
June
57.4
73
65
60
76
July
67.9
83
81
70
85
August
80.7
76
77
91
71
September
80.9
74
83
72
79
October
86.1
91
80
76
93
November
88.7
96
84
96
77
December
89.3
92
89
90
92
Average
75.8
81.4
81.3
80.9
80.1
83.6
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.