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
95.6
98
98
91
96
95
February
95.5
91
97
95
94
100
March
92.9
92
93
91
89
95
April
89.2
89
86
87
92
May
85.0
91
84
93
86
June
80.2
79
75
88
71
July
83.9
80
85
92
92
August
85.2
93
82
71
95
September
84.8
84
87
78
86
October
91.0
94
91
96
89
November
94.7
98
93
96
94
December
96.0
95
98
98
99
Average
90.2
93.8
91.2
87.6
90.0
91.3
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.