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
95.3
92
96
90
98
98
February
93.5
91
94
90
93
93
March
94.1
97
93
89
90
95
April
95.9
96
96
97
90
May
96.8
96
96
99
98
June
0
0
0
0
July
94.6
95
92
87
98
August
98.0
98
95
96
100
September
98.9
98
100
97
99
October
98.7
99
98
98
98
November
98.1
96
100
97
100
December
96.5
94
92
98
100
Average
96.2
94.2
96.0
94.8
95.3
96.7
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.