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
86.1
81
88
76
88
92
February
94.4
96
89
93
93
93
March
97.2
95
97
95
97
98
April
99.3
98
99
100
100
May
99.4
99
100
100
100
June
99.7
100
99
100
100
July
100.0
100
100
100
100
August
100.0
100
100
100
100
September
100.0
100
100
100
100
October
97.9
96
96
99
100
November
86.9
96
84
71
91
December
78.1
71
59
93
81
Average
94.9
90.5
94.8
93.2
95.1
96.4
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.