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
80.2
83
84
91
71
78
February
82.3
79
88
88
79
90
March
89.1
88
95
89
88
88
April
96.1
94
99
98
96
May
98.2
98
98
97
98
June
99.8
100
100
100
100
July
100.0
100
100
100
100
August
99.9
100
100
100
100
September
98.2
97
99
98
100
October
96.8
99
98
91
95
November
86.3
99
87
79
90
December
75.4
89
60
85
66
Average
91.9
83.3
95.8
94.3
91.8
93.0
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.