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
95.7
91
99
99
100
87
February
94.6
97
100
97
88
97
March
96.1
100
100
95
100
100
April
99.4
100
100
100
100
May
99.6
100
100
99
100
June
99.8
100
100
100
100
July
99.4
100
100
100
100
August
97.5
98
99
97
97
September
99.0
100
100
100
97
October
98.8
100
100
100
98
November
99.1
100
99
99
99
December
97.2
97
100
100
100
Average
97.8
96.1
99.3
98.9
98.5
97.8
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.