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
87.7
78
86
84
96
88
February
90.3
86
94
91
88
94
March
89.0
86
87
91
84
94
April
89.6
92
90
97
84
May
79.6
70
82
75
93
June
73.9
77
65
72
78
July
82.1
84
85
81
89
August
83.3
75
79
94
78
September
83.2
76
87
72
80
October
88.4
93
85
77
92
November
91.0
97
90
99
81
December
91.0
92
96
94
93
Average
84.6
83.9
82.9
83.2
83.6
86.2
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.