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
60.0
58
69
69
51
61
February
72.6
57
75
85
76
89
March
82.4
77
86
91
79
88
April
92.8
90
90
95
97
May
93.5
98
95
96
90
June
95.0
98
98
100
87
July
94.6
98
98
94
98
August
95.3
88
93
94
98
September
91.7
97
90
93
92
October
84.2
82
86
88
80
November
62.3
70
56
56
68
December
56.5
46
58
54
53
Average
83.1
65.2
86.6
87.9
85.4
86.6
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.