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
59.4
71
61
52
56
52
February
74.4
61
81
70
74
84
March
86.7
88
89
93
93
88
April
93.2
92
90
93
99
May
95.4
97
100
91
99
June
95.1
98
95
90
95
July
95.5
93
99
86
99
August
94.8
90
99
94
100
September
92.0
94
94
92
94
October
79.5
84
79
77
80
November
62.5
59
62
59
71
December
51.1
52
65
38
38
Average
83.7
74.7
85.5
86.8
81.9
86.9
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.