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
96.1
99
97
97
89
93
February
93.9
90
97
86
96
92
March
93.1
96
99
75
95
97
April
98.8
99
97
99
100
May
97.8
97
96
99
97
June
97.6
99
100
97
96
July
96.7
100
90
98
92
August
99.4
100
100
100
100
September
99.1
99
99
100
99
October
97.5
100
96
99
95
November
96.4
99
100
90
94
December
96.5
98
100
100
96
Average
96.6
95.6
98.4
94.0
96.6
95.5
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.