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
78.3
81
78
77
73
87
February
87.4
97
86
96
87
95
March
91.0
79
95
93
95
April
92.9
93
91
93
100
May
93.2
92
94
95
95
June
95.7
100
99
97
87
July
97.0
99
98
95
98
August
95.7
94
96
92
96
September
94.7
95
96
96
91
October
90.3
96
92
89
89
November
75.3
94
89
58
74
December
79.0
87
55
54
78
Average
90.4
89.6
91.8
92.2
87.7
91.6
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.