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
84.4
88
87
83
85
80
February
85.5
90
83
89
88
79
March
87.9
82
88
94
94
91
April
92.1
99
90
92
85
May
95.9
99
94
91
99
June
95.5
97
92
98
93
July
98.3
97
99
99
99
August
91.2
94
90
88
92
September
90.6
97
99
85
92
October
79.7
87
85
86
73
November
69.7
60
58
76
77
December
79.3
76
76
81
84
Average
89.3
86.1
91.7
90.1
90.2
89.1
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.