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
69.8
60
72
59
79
66
February
81.3
84
91
85
78
83
March
93.3
95
94
96
100
96
April
97.8
100
96
99
100
May
96.9
89
100
98
99
June
99.5
99
99
100
100
July
99.6
99
99
100
100
August
99.7
100
100
100
100
September
98.2
100
98
99
100
October
89.5
96
99
92
89
November
76.2
93
79
71
63
December
72.5
75
63
69
75
Average
90.2
80.7
93.3
92.0
92.2
91.4
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.