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
87.3
87
98
97
87
73
February
86.1
84
99
87
87
83
March
92.0
95
100
93
77
89
April
97.5
100
100
99
99
May
99.2
99
100
100
100
June
99.1
98
100
100
99
July
98.4
98
100
99
99
August
98.2
95
100
98
100
September
98.9
96
100
100
100
October
98.3
99
100
98
100
November
99.5
100
100
100
91
December
96.7
100
100
94
96
Average
95.5
88.3
98.7
97.0
95.9
91.6
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.