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
60.3
79
77
67
56
67
February
70.5
77
73
71
76
69
March
79.5
84
78
90
82
78
April
90.5
93
97
92
80
May
91.4
100
92
92
89
June
95.3
96
96
96
July
91.7
92
98
90
August
91.6
97
90
93
September
84.1
86
91
88
October
67.7
72
67
58
November
54.8
100
33
58
68
December
55.1
62
67
79
56
Average
82.1
80.5
80.5
86.6
86.7
82.9
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.