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
78.7
82
88
71
77
82
February
87.5
91
81
97
90
98
March
93.4
95
98
93
96
95
April
96.4
98
96
97
99
May
93.3
92
87
98
100
June
96.1
97
97
93
98
July
97.0
99
99
91
99
August
97.2
96
99
96
98
September
93.8
98
96
90
89
October
91.8
93
90
89
95
November
81.1
92
76
67
85
December
75.5
76
56
73
79
Average
91.4
89.8
93.5
90.8
89.7
94.3
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.