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
60.2
68
55
69
48
66
February
71.8
68
73
82
70
86
March
87.7
81
88
96
84
94
April
92.8
88
91
88
100
May
94.9
96
98
98
95
June
96.2
97
96
98
90
July
95.5
97
94
94
98
August
95.1
95
98
89
93
September
88.6
97
81
93
88
October
81.4
77
85
89
80
November
62.3
64
51
61
63
December
56.7
51
35
45
58
Average
83.9
72.9
85.3
86.3
83.6
87.1
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.