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
72.3
77
63
86
73
83
February
83.1
95
91
94
70
99
March
88.5
88
93
91
89
88
April
96.1
96
98
95
100
May
97.5
99
98
97
100
June
97.7
98
99
98
97
July
98.5
100
99
100
98
August
99.4
100
99
99
100
September
99.1
100
98
100
99
October
93.5
100
99
93
91
November
72.1
92
85
85
64
December
56.5
78
37
59
33
Average
89.6
86.8
93.7
93.4
90.3
90.0
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.