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
92.2
88
99
100
97
73
February
85.9
96
92
92
68
89
March
92.1
95
100
91
92
99
April
97.7
100
100
100
100
May
99.3
98
100
98
100
June
98.8
99
100
98
97
July
97.8
97
99
98
95
August
95.4
98
91
95
94
September
97.0
98
95
97
97
October
93.7
97
97
96
93
November
94.3
94
97
98
98
December
88.2
84
100
86
100
Average
94.3
93.0
96.4
96.8
94.1
95.0
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.