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
77.7
74
69
70
50
100
February
81.7
70
64
74
70
99
March
74.3
69
61
68
66
71
April
73.9
66
69
72
74
May
87.1
78
76
70
99
June
85.5
75
73
68
100
July
87.3
76
69
72
100
August
83.8
69
68
70
100
September
83.4
68
64
69
100
October
84.3
73
67
74
100
November
82.7
76
66
68
100
December
76.2
62
64
50
100
Average
81.7
70.7
69.7
69.0
66.3
95.1
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.