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
52.3
69
37
52
42
40
February
66.7
65
57
76
75
73
March
86.8
86
95
83
86
93
April
95.4
99
98
96
92
May
98.9
100
99
98
100
June
99.7
100
100
100
100
July
99.6
100
100
99
100
August
99.2
100
100
100
99
September
97.5
100
96
97
97
October
91.6
95
93
85
90
November
70.0
90
72
67
61
December
43.4
60
43
53
12
Average
85.0
74.4
88.8
88.2
86.2
83.6
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.