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
94.9
98
98
98
84
96
February
89.2
81
87
93
79
100
March
82.2
80
87
63
90
79
April
79.3
84
64
69
86
May
84.6
69
87
89
88
June
89.5
90
97
76
82
July
95.3
94
90
96
99
August
95.2
88
94
96
97
September
93.9
85
96
92
95
October
95.9
95
96
100
92
November
92.2
83
84
95
98
December
91.9
92
97
91
86
Average
89.7
85.9
87.3
87.6
87.9
91.2
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.