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
79.5
71
79
70
91
72
February
71.8
60
56
82
74
69
March
85.1
72
93
96
91
85
April
94.1
97
95
93
95
May
96.9
97
99
95
100
June
98.3
99
99
99
96
July
99.4
99
100
100
100
August
99.3
98
100
100
99
September
97.5
98
98
96
99
October
84.0
83
93
93
78
November
82.6
92
85
77
81
December
80.4
75
82
85
70
Average
88.3
67.6
90.7
93.1
92.6
88.9
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.