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
78.2
84
59
81
76
65
February
82.7
78
81
85
80
74
March
85.9
87
84
92
78
76
April
89.5
97
94
79
86
77
May
91.3
88
79
95
89
June
95.7
89
87
100
97
July
95.9
93
86
99
95
August
97.4
92
93
100
98
September
98.3
97
96
99
98
October
91.4
94
93
96
83
November
78.0
87
89
66
64
December
71.8
92
43
69
45
Average
88.7
87.2
88.0
85.0
88.3
81.7
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.