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
90.1
96
95
90
98
81
February
95.8
88
96
97
99
91
March
99.5
99
99
100
100
100
April
99.1
98
98
99
99
May
98.6
98
98
100
100
June
93.2
85
94
97
89
July
97.8
97
94
99
99
August
97.3
93
97
98
100
September
98.3
98
95
99
99
October
97.8
95
99
98
98
November
99.0
100
98
100
98
December
94.0
97
98
98
99
Average
96.4
94.4
95.7
96.3
98.7
96.0
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.