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
66.6
80
75
72
73
36
February
81.7
89
92
89
66
91
March
96.2
100
96
98
96
96
April
98.0
96
99
96
100
May
98.7
98
100
98
99
June
99.3
100
100
100
98
July
99.2
99
99
99
100
August
98.9
98
100
96
99
September
96.4
96
93
98
98
October
91.3
90
76
97
93
November
73.3
76
66
73
62
December
63.2
52
67
79
73
Average
91.0
90.5
91.4
91.4
91.5
90.2
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.