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
98.2
99
100
93
97
February
98.7
100
100
99
97
March
91.7
95
98
87
86
April
94.7
96
94
92
May
96.2
99
97
89
June
97.5
92
98
99
July
99.0
100
100
97
100
August
98.3
99
99
96
100
September
98.3
99
100
98
October
99.6
100
100
100
100
November
99.1
98
100
100
0
December
98.9
100
100
96
Average
97.1
97.9
98.1
97.1
97.7
92.8
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.