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
96.8
99
97
98
93
100
February
97.4
100
95
97
97
99
March
95.7
95
100
91
90
99
April
95.3
94
99
94
100
May
98.8
99
97
100
100
June
98.3
100
99
98
100
July
98.7
100
99
99
100
August
99.4
100
100
100
100
September
99.3
100
97
99
100
October
99.7
100
100
100
100
November
99.2
100
100
100
100
December
99.5
100
100
100
100
Average
98.1
98.1
98.6
97.8
97.5
99.7
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.