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
90.0
93
96
84
95
86
February
91.7
94
88
94
92
90
March
93.7
99
93
89
88
96
April
94.4
97
95
95
91
May
92.3
92
95
98
92
June
88.5
80
83
93
94
July
93.0
89
94
90
98
August
93.3
93
89
90
94
September
97.0
97
100
94
99
October
98.2
100
98
95
98
November
98.5
100
99
100
99
December
94.2
95
93
95
100
Average
93.5
96.1
91.7
92.1
93.1
94.5
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.