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
93.7
93
100
96
90
96
February
94.8
91
91
95
99
94
March
96.2
100
89
99
91
98
April
96.5
97
100
97
94
93
May
97.6
98
99
98
96
June
98.8
99
96
100
99
July
98.1
100
97
97
99
August
98.9
99
99
98
100
September
97.9
97
97
97
98
October
98.9
100
97
99
100
November
98.1
100
98
96
99
December
95.0
94
90
93
99
Average
97.3
95.9
97.6
97.0
96.4
97.6
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.