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
91.0
85
100
98
90
85
February
92.1
100
100
91
98
91
March
93.8
98
0
93
92
April
94.4
91
99
100
May
99.3
100
99
100
June
99.0
100
100
99
99
July
97.2
94
100
99
98
August
94.9
88
92
98
94
September
95.4
89
96
96
93
October
98.2
95
100
99
99
November
96.5
100
96
100
100
December
90.7
76
93
90
Average
95.2
95.0
92.5
95.7
97.4
94.5
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.