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
69.4
76
73
77
63
75
February
77.5
89
80
87
67
78
March
87.0
89
81
89
88
90
April
89.0
97
95
95
84
89
May
90.5
82
95
96
97
June
96.2
95
100
96
90
July
99.6
100
99
100
99
August
98.5
99
97
100
97
September
94.6
98
89
96
90
October
88.3
94
84
90
82
November
66.1
69
72
59
71
December
64.0
75
51
60
48
Average
86.8
88.1
87.9
89.2
85.6
84.7
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.