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
77.5
88
82
87
76
58
February
86.8
92
83
96
79
97
March
96.0
96
98
99
93
98
April
98.0
97
97
98
100
May
98.6
98
98
100
98
June
99.1
99
98
100
98
July
98.4
99
99
97
98
August
98.1
99
97
98
96
September
95.0
96
92
98
97
October
84.3
91
76
87
85
November
71.0
93
60
71
54
December
73.9
70
77
77
59
Average
91.8
92.4
93.7
91.6
91.5
89.3
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.