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
95.5
99
92
93
100
98
February
95.1
98
95
89
94
99
March
95.8
94
98
88
95
100
April
97.1
100
92
100
99
May
96.3
100
83
100
99
June
98.4
100
96
100
100
July
98.0
100
89
100
100
August
99.6
100
99
100
100
September
99.7
100
100
100
100
October
99.8
100
100
100
100
November
95.9
97
98
98
90
December
97.0
98
100
95
95
Average
97.3
96.7
98.5
93.4
98.5
98.6
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.