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
86.7
88
90
85
86
81
February
90.7
90
72
99
87
95
March
95.6
92
96
100
99
April
97.0
93
97
100
100
May
97.7
94
98
99
98
June
98.9
100
100
99
98
July
98.0
93
100
98
100
August
97.8
92
100
98
98
September
95.3
93
93
98
94
October
88.9
83
83
86
96
November
76.9
84
64
77
67
December
76.3
67
73
81
75
Average
92.3
88.7
89.2
92.0
94.0
93.6
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.