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
75.5
83
85
65
76
70
February
84.8
81
85
89
74
91
March
89.8
90
86
92
92
94
April
93.5
91
95
90
100
May
95.1
93
98
94
100
June
95.7
99
98
92
98
July
95.0
93
97
89
94
August
94.6
90
97
92
96
September
92.1
93
93
94
92
October
91.2
92
93
86
92
November
81.5
83
89
73
87
December
70.7
71
75
69
83
Average
89.4
85.0
89.6
92.2
87.0
90.4
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.