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
83.4
95
82
92
91
90
February
87.8
97
98
97
80
96
March
92.4
87
94
95
95
95
April
97.3
97
99
94
97
May
98.3
95
98
100
100
June
99.0
99
99
100
100
July
99.8
100
100
100
100
August
99.9
100
100
100
100
September
99.6
100
100
100
100
October
97.8
100
100
92
99
November
85.7
94
91
78
96
December
80.7
89
76
89
65
Average
94.2
92.2
96.0
96.7
94.3
95.7
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.