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
76.3
72
79
59
84
76
February
74.0
69
68
79
74
72
March
90.6
91
98
95
95
95
April
98.4
100
98
96
100
May
98.8
99
100
98
100
June
99.4
99
100
100
99
July
99.8
100
100
100
100
August
99.7
100
100
100
100
September
97.6
99
99
96
100
October
87.8
87
98
89
83
November
83.6
95
89
78
71
December
70.5
76
68
64
61
Average
90.2
78.0
93.3
92.9
91.6
90.5
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.