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
95.2
100
98
76
100
100
February
92.0
100
100
98
96
86
March
89.7
100
99
98
99
100
April
93.5
99
100
100
100
May
90.7
99
98
99
99
June
85.4
98
100
99
100
July
98.4
100
100
99
100
August
99.3
98
100
98
100
September
99.7
100
100
99
100
October
99.8
100
100
100
100
November
99.7
99
100
100
99
December
98.1
100
100
100
88
Average
95.5
99.9
99.2
97.3
99.2
97.6
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.