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
65.3
67
60
73
66
67
February
73.2
57
87
70
75
72
March
84.4
81
88
92
91
79
April
89.9
86
83
95
90
May
86.7
90
92
83
83
June
89.3
92
90
88
84
July
91.5
87
97
85
93
August
92.5
89
95
93
91
September
87.2
92
89
85
88
October
81.1
80
87
87
71
November
74.9
59
87
75
95
December
60.3
53
84
72
42
Average
81.6
69.4
82.2
87.6
84.0
81.1
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.