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
67.8
89
72
83
74
43
February
86.6
98
88
97
86
98
March
94.5
97
98
98
91
94
April
96.8
99
94
97
96
100
May
97.0
95
99
99
98
June
96.3
98
99
100
91
July
98.9
100
100
99
98
August
96.6
97
92
97
96
September
97.4
98
94
99
100
October
91.8
99
86
92
89
November
78.6
93
63
77
54
December
74.5
87
91
61
78
Average
91.8
96.0
94.1
92.7
91.1
88.6
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.