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
97.3
96
100
91
100
94
February
97.2
96
100
100
95
89
March
98.3
100
98
98
100
96
April
98.7
100
99
99
98
May
97.8
96
94
99
97
June
99.2
98
100
100
99
July
98.9
96
100
100
99
August
95.5
98
85
97
94
September
99.2
100
100
100
97
October
97.7
96
98
100
98
November
95.9
86
100
99
92
December
98.8
100
97
100
99
Average
97.8
97.1
97.0
96.7
98.9
95.9
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.