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
90.5
92
91
92
85
February
98.0
100
99
98
96
96
March
98.8
100
99
99
98
99
April
99.8
100
100
100
100
May
100.0
100
100
100
100
June
99.7
99
100
100
100
July
100.0
100
100
100
100
August
100.0
100
100
100
100
September
99.9
100
100
100
100
October
100.0
100
100
100
100
November
98.3
99
100
94
100
December
90.7
86
87
97
92
Average
98.6
97.4
98.1
98.6
98.1
99.0
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.