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
75.7
83
87
71
68
68
February
87.0
86
75
94
82
93
March
91.1
87
87
97
92
94
April
95.8
96
94
95
95
100
May
96.2
95
100
95
100
June
97.0
99
98
96
96
July
95.4
93
98
90
95
August
96.3
93
97
96
98
September
94.4
95
96
93
95
October
91.3
89
92
92
90
November
79.6
85
81
71
80
December
70.8
70
74
59
70
Average
90.8
88.6
90.1
93.2
88.1
91.9
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.