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
96.5
98
93
97
91
100
February
97.0
99
96
97
99
99
March
94.9
98
100
91
91
95
April
96.3
97
99
95
100
May
99.3
100
99
100
99
June
99.4
100
99
100
100
July
98.6
100
94
99
100
August
99.0
100
99
100
100
September
99.3
100
96
99
100
October
99.0
99
99
100
100
November
97.6
97
97
99
100
December
97.9
100
97
99
99
Average
97.9
98.5
98.5
96.9
97.7
99.1
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.