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
83.9
96
99
64
93
92
February
93.2
96
90
98
94
95
March
96.2
95
100
94
100
98
April
99.7
100
100
100
99
May
99.2
100
100
100
100
June
99.9
100
100
100
100
July
99.9
100
100
100
100
August
99.9
100
100
100
100
September
99.9
100
100
100
100
October
99.3
100
97
100
100
November
96.8
98
98
99
97
December
87.9
92
100
80
100
Average
96.7
95.6
98.4
96.5
97.7
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.