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
86.0
88
66
82
94
94
February
89.7
98
97
82
86
89
March
94.2
98
97
89
93
92
April
95.4
100
97
85
98
98
May
92.7
99
83
96
97
June
93.5
99
85
93
97
July
87.2
93
80
89
90
August
87.7
93
81
98
94
September
83.3
80
88
97
94
October
89.2
95
76
92
94
November
92.1
89
95
92
93
December
85.3
87
83
92
82
Average
90.9
96.2
91.6
83.8
93.2
93.1
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.