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
95.3
99
89
94
100
98
February
96.5
94
99
97
96
99
March
94.9
98
99
97
98
96
April
95.2
100
97
94
100
97
May
91.6
95
81
100
97
June
98.5
95
97
100
100
July
99.4
99
100
100
100
August
99.6
100
99
100
100
September
99.8
100
100
100
100
October
96.4
100
98
98
100
November
94.7
97
99
100
96
December
96.2
97
100
98
89
Average
96.6
97.5
97.2
96.1
99.1
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.