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
92.5
97
88
86
100
96
February
80.7
76
67
89
88
84
March
93.4
90
99
99
98
92
April
96.7
99
98
100
100
May
98.3
100
100
97
98
June
99.1
99
99
100
97
July
99.7
100
100
99
100
August
99.6
99
100
100
99
September
99.4
100
100
100
99
October
92.1
94
99
94
86
November
92.4
96
97
94
87
December
90.8
92
89
100
76
Average
94.4
87.5
95.5
97.2
97.8
93.7
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.