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
97.3
99
97
91
96
100
February
96.7
97
98
94
98
99
March
98.2
99
98
98
99
98
April
96.7
95
95
97
98
May
99.2
100
100
97
100
June
99.2
100
98
100
100
July
98.6
100
96
99
98
August
98.3
100
97
100
99
September
98.3
97
100
99
98
October
99.4
100
99
99
99
November
98.7
100
95
99
99
December
98.2
100
94
98
98
Average
98.2
98.6
98.6
96.4
98.1
98.6
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.