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
69.0
72
70
67
85
54
February
75.0
64
72
83
77
92
March
77.2
73
76
83
76
91
April
91.5
93
91
95
100
May
93.3
99
95
93
94
June
93.3
95
98
99
89
July
94.8
98
95
90
96
August
95.7
90
95
91
98
September
90.5
73
98
90
92
October
87.6
85
81
92
92
November
82.1
88
90
85
76
December
71.5
61
92
59
70
Average
85.4
69.9
85.8
90.3
87.9
89.6
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.