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
93.7
99
100
90
96
95
February
88.8
98
88
97
80
74
March
85.2
92
84
88
68
94
April
94.0
95
95
99
100
May
94.4
95
100
96
94
June
95.2
99
96
88
99
July
89.8
93
97
95
83
August
94.5
95
94
99
94
September
92.4
89
96
91
95
October
87.8
93
92
89
90
November
88.3
95
88
80
87
December
93.9
91
95
96
100
Average
91.9
95.8
93.2
94.0
89.8
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.