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
93.2
94
97
91
91
96
February
97.2
99
96
97
94
100
March
98.6
99
99
98
97
99
April
98.9
98
99
99
99
May
99.3
99
99
100
99
June
98.3
99
99
100
99
July
98.6
96
100
98
99
August
97.7
97
97
100
96
September
97.9
98
97
96
99
October
94.9
100
99
95
93
November
90.9
87
92
91
87
December
94.4
91
96
98
93
Average
96.8
97.5
96.3
96.8
96.7
96.5
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.