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
74.9
88
75
78
61
80
February
82.8
83
91
76
80
92
March
89.5
83
89
89
98
93
April
92.9
90
93
96
93
May
94.4
98
99
90
96
June
94.3
100
95
98
97
July
97.1
97
98
98
94
August
93.9
88
95
96
96
September
88.8
90
90
95
89
October
80.2
90
86
69
68
November
75.2
66
67
75
86
December
70.7
70
72
75
56
Average
89.2
83.8
90.8
91.0
90.0
90.6
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.