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
99.9
100
100
100
100
100
February
99.4
100
100
100
100
100
March
98.8
99
100
100
100
100
April
98.0
100
100
99
100
100
May
97.6
100
100
100
100
June
97.7
100
100
100
100
July
96.9
99
100
100
100
August
96.0
100
100
100
100
September
97.3
99
100
100
100
October
98.4
100
100
100
100
November
99.1
100
100
100
100
December
99.7
100
100
100
100
Average
98.2
99.6
99.7
99.8
99.8
99.9
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.