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
98.7
100
99
100
100
100
February
99.3
100
100
100
100
100
March
98.2
100
98
100
99
100
April
98.2
100
98
99
95
May
93.5
98
96
93
96
June
92.2
91
97
96
96
July
91.6
94
89
98
83
August
95.3
81
96
97
96
September
97.9
99
97
99
100
October
98.6
99
99
100
November
97.5
100
100
100
100
December
97.9
99
99
100
100
Average
97.2
99.8
98.1
97.8
97.9
97.4
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.