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
93.6
93
100
92
96
91
February
96.0
97
97
99
92
99
March
98.1
97
100
98
99
99
April
98.8
99
100
97
97
May
97.7
98
98
98
98
June
98.5
97
99
99
100
July
98.6
99
100
99
99
August
99.1
100
99
98
98
September
98.9
99
100
99
99
October
96.1
98
98
95
98
November
90.9
97
88
92
94
December
87.1
94
76
81
87
Average
96.5
95.7
98.0
96.7
95.9
96.9
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.