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
91.1
93
92
98
77
88
February
95.2
91
99
99
93
94
March
92.2
87
89
91
98
98
April
97.6
99
97
97
100
May
98.5
99
99
100
98
June
99.0
99
100
99
99
July
98.2
99
100
99
98
August
98.6
98
98
100
99
September
98.5
99
98
99
99
October
96.1
93
98
96
100
November
93.8
93
92
94
95
December
91.2
92
84
95
90
Average
95.4
89.7
96.0
96.5
95.9
96.8
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.