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
91.9
92
92
87
February
98.6
98
100
99
97
March
99.1
100
97
100
100
100
April
99.2
100
100
90
98
May
99.7
99
100
100
June
99.0
99
100
98
98
July
89.8
85
91
74
98
August
91.2
84
88
87
92
September
96.5
96
97
93
97
October
98.8
99
97
90
100
November
98.6
99
98
94
100
December
98.1
100
100
89
88
Average
97.1
97.3
95.3
97.0
94.8
97.1
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.