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
98.8
100
99
99
99
99
February
98.8
98
97
100
100
99
March
98.8
100
96
99
97
100
April
99.1
99
99
100
100
May
97.5
100
98
87
100
June
97.5
100
94
97
97
July
94.0
100
87
90
89
August
91.4
100
92
71
94
September
96.3
99
95
100
100
October
96.1
99
85
96
100
November
96.7
100
86
96
100
December
98.9
100
100
99
99
Average
97.2
99.1
98.9
94.2
94.6
98.3
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.