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
98.2
99
100
98
95
100
February
95.9
97
92
96
97
95
March
93.9
91
100
90
86
94
April
93.5
99
96
89
93
May
96.0
99
92
92
98
June
98.1
97
98
97
100
July
96.9
100
93
96
96
August
97.2
100
100
91
100
September
96.6
99
99
98
98
October
98.4
100
93
99
100
November
98.9
100
100
99
97
December
98.0
100
99
97
100
Average
96.5
94.9
98.6
95.9
94.4
97.5
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.