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
74.8
88
73
77
73
88
February
84.1
93
90
97
75
92
March
88.6
81
92
94
90
95
April
89.6
83
86
85
99
May
90.3
86
98
92
92
June
94.8
92
94
98
87
July
95.6
97
95
96
98
August
92.8
93
91
88
95
September
86.1
92
78
84
89
October
88.2
96
91
93
72
November
70.8
78
60
74
78
December
68.9
72
60
59
57
Average
87.1
86.5
88.1
87.7
86.1
88.3
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.