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
91.8
96
94
93
89
90
February
92.3
93
94
98
94
87
March
91.3
96
88
92
91
98
April
90.9
93
87
94
94
May
95.2
92
94
98
98
June
93.4
98
84
95
93
July
93.0
93
95
98
95
August
92.2
91
91
88
91
September
86.9
77
88
86
92
October
86.2
76
85
89
87
November
90.4
87
90
96
93
December
91.9
90
99
96
86
Average
91.6
95.0
88.7
91.1
92.7
91.8
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.