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
79.6
84
88
65
88
91
February
83.3
84
86
72
95
77
March
86.9
97
89
90
80
88
April
91.3
96
90
89
85
May
93.0
92
94
97
95
June
93.1
96
85
94
99
July
91.9
90
84
96
93
August
93.1
87
90
98
93
September
90.8
86
95
86
82
October
93.2
96
94
92
98
November
91.8
97
95
87
86
December
87.5
78
97
87
100
Average
90.2
89.5
90.9
88.2
91.6
90.3
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.