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
56.1
67
50
71
54
53
February
71.7
66
66
82
77
88
March
86.9
94
89
98
76
91
April
93.6
89
93
95
98
May
95.0
97
93
90
95
June
95.8
95
95
98
94
July
95.1
99
93
100
98
August
93.4
95
98
89
94
September
91.8
97
85
91
96
October
81.4
80
81
84
83
November
58.7
76
54
62
50
December
51.7
58
38
53
62
Average
84.0
77.4
86.3
86.4
84.5
87.1
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.