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
98.0
98
99
100
95
100
February
96.2
96
98
99
91
98
March
96.8
98
97
98
98
96
April
98.3
95
99
100
99
May
95.8
97
94
93
96
June
97.0
98
92
98
96
July
89.9
83
91
85
84
August
92.3
92
87
93
90
September
92.3
97
89
95
91
October
95.2
98
95
89
95
November
96.1
98
94
98
96
December
96.6
96
94
96
99
Average
95.5
97.4
95.4
94.0
93.9
94.5
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.