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
91.4
95
92
99
85
92
February
93.4
87
99
94
93
99
March
90.8
90
90
91
92
95
April
91.8
93
97
97
96
May
96.2
95
95
96
100
June
94.8
94
96
96
89
July
94.4
92
98
90
93
August
91.5
90
96
89
80
September
93.2
86
94
90
96
October
94.9
94
95
97
96
November
92.5
93
95
90
89
December
87.6
93
83
88
91
Average
92.7
90.1
92.4
95.0
92.3
92.7
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.