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
73.9
79
65
89
55
89
February
82.0
70
85
89
91
93
March
86.4
77
80
95
91
91
April
94.6
92
92
96
98
May
96.0
100
95
92
96
June
97.3
97
99
95
98
July
91.6
99
55
97
98
August
93.0
87
90
92
99
September
91.4
96
97
97
92
October
88.3
81
91
96
81
November
71.2
61
68
88
86
December
67.6
59
59
79
62
Average
87.4
75.3
87.4
86.6
91.1
92.4
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.