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
95.9
97
94
89
99
100
February
89.3
77
77
94
79
100
March
92.0
94
100
85
83
98
April
91.9
82
100
87
95
100
May
96.0
91
95
97
92
June
93.6
95
81
96
98
July
89.7
95
96
81
80
August
86.9
81
87
96
95
September
94.0
96
97
96
97
October
96.4
100
82
99
99
November
97.0
92
96
98
100
December
97.6
98
100
97
95
Average
92.7
87.6
92.0
90.2
93.0
95.6
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.