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
96.2
98
97
92
98
99
February
96.6
97
93
99
99
100
March
96.3
98
96
96
95
100
April
96.3
99
92
98
94
May
97.5
99
95
98
100
June
97.1
91
99
100
100
July
97.0
91
98
100
100
August
99.2
97
100
100
100
September
97.1
91
99
98
100
October
98.6
95
100
100
100
November
97.4
95
100
100
96
December
98.6
100
95
99
99
Average
97.7
97.4
95.1
97.1
98.7
98.8
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.