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
80.9
91
83
80
82
70
February
85.3
80
84
91
77
95
March
90.1
87
85
93
91
94
April
94.1
87
96
97
97
May
95.6
94
96
95
98
June
96.0
97
99
91
96
July
92.7
95
97
89
90
August
94.9
93
99
94
94
September
91.5
94
96
89
88
October
90.0
86
92
89
94
November
82.9
85
87
77
82
December
72.6
75
76
61
71
Average
88.2
85.8
89.5
93.6
87.9
90.6
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.