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
98.9
100
100
100
99
97
February
99.2
100
100
100
100
99
March
99.1
100
100
99
100
100
April
99.9
100
100
100
100
May
98.0
100
98
100
93
June
98.1
99
100
99
99
July
77.6
75
73
87
91
August
68.6
80
65
78
69
September
97.6
100
99
94
98
October
99.7
100
100
100
100
November
100.0
100
100
100
100
December
99.9
100
100
100
100
Average
95.0
100.0
95.7
93.8
96.2
95.1
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.