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
74.9
74
90
72
61
83
February
78.0
90
71
71
81
88
March
86.5
91
89
93
93
89
April
90.9
98
82
90
97
May
99.2
99
98
100
99
June
99.5
100
100
100
99
July
99.7
100
100
99
100
August
98.3
100
100
100
98
September
96.7
97
93
98
99
October
92.6
88
91
95
99
November
77.8
73
70
87
70
December
72.7
78
83
77
78
Average
90.1
86.1
92.6
90.4
92.5
93.7
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.