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
68.9
54
70
75
81
67
February
84.6
63
76
98
96
68
March
80.2
74
58
93
91
84
April
88.9
91
83
89
90
May
90.8
79
97
95
91
June
96.6
92
99
100
95
July
98.1
99
100
99
95
August
96.2
94
100
96
95
September
97.2
98
100
99
95
October
88.0
89
97
88
96
November
83.8
66
83
96
85
December
72.9
69
75
81
81
Average
85.0
63.7
81.9
92.1
92.8
86.1
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.