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
69.7
67
74
62
69
71
February
85.8
86
92
85
86
90
March
95.1
94
96
97
98
95
April
98.9
100
99
98
98
May
96.4
89
99
99
99
June
99.5
98
100
100
100
July
99.7
100
100
100
100
August
99.6
100
99
100
100
September
98.6
100
98
99
100
October
91.1
95
99
90
93
November
76.8
88
80
61
65
December
70.8
76
62
73
76
Average
91.1
87.8
93.1
92.3
92.6
90.3
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.