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
70.6
83
83
79
73
69
February
72.6
74
80
83
69
86
March
80.0
76
86
82
75
90
April
93.1
93
99
83
96
May
93.9
93
90
99
96
June
99.4
100
100
98
99
July
99.2
100
99
100
100
August
99.6
100
99
99
100
September
96.7
98
99
93
97
October
90.8
100
95
85
93
November
70.4
84
70
79
61
December
60.3
65
45
77
34
Average
86.4
77.3
91.6
89.7
87.7
88.0
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.