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
99.3
99
99
100
50
100
February
96.6
95
98
97
March
98.0
98
99
97
April
97.2
98
96
May
90.2
90
90
100
0
June
86.5
94
76
100
July
92.9
89
97
100
0
August
97.3
98
97
100
September
88.5
84
93
October
89.8
88
92
100
100
November
96.7
94
100
December
96.7
96
99
Average
95.1
97.5
93.9
95.2
88.8
85.7
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.