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
71
97
99
100
100
February
96.0
76
100
100
98
100
March
93.1
61
98
97
98
98
April
98.5
99
99
100
99
May
99.3
99
100
99
100
June
99.1
99
100
99
98
July
99.3
98
100
100
100
August
98.0
89
100
100
99
September
94.1
63
99
100
100
October
94.0
67
100
100
99
November
93.5
73
98
92
100
December
91.9
54
98
100
97
Average
93.6
68.5
86.9
99.1
98.8
99.1
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.