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
94.3
87
100
97
99
77
February
92.0
90
100
93
85
90
March
97.4
100
100
98
95
99
April
99.7
99
100
100
100
May
100.0
100
100
100
100
June
98.9
100
97
100
96
July
99.5
100
99
100
100
August
98.8
98
98
99
98
September
99.1
100
99
100
98
October
99.2
100
98
99
100
November
99.3
100
100
100
99
December
92.8
78
100
97
100
Average
97.1
92.1
97.7
98.1
97.8
96.6
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.