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
68.2
67
55
69
54
84
February
76.6
56
82
81
80
91
March
81.2
68
71
97
93
84
April
91.6
78
91
92
94
96
May
92.6
96
95
79
95
June
95.8
100
94
97
97
July
96.9
96
97
99
95
August
91.9
82
94
88
97
September
88.0
85
95
88
79
October
81.0
89
82
76
72
November
67.9
51
78
81
75
December
56.7
40
76
67
56
Average
84.7
68.7
83.4
90.3
86.2
88.3
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.