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
67.5
71
74
63
59
66
February
72.8
82
67
58
81
70
March
85.1
86
85
90
90
89
April
90.7
100
78
93
91
May
98.0
98
96
100
97
June
98.1
100
98
100
95
July
98.1
99
99
98
98
August
97.0
99
100
100
94
September
94.4
96
87
92
97
October
88.2
81
80
92
96
November
70.6
68
59
78
60
December
67.4
67
77
76
76
Average
88.0
80.8
89.8
86.0
91.3
88.8
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.