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
84.6
78
100
84
81
88
February
81.8
73
82
89
69
88
March
86.9
88
81
97
78
80
April
93.5
92
89
97
89
May
91.1
96
81
93
0
June
0
0
0
0
July
60.4
14
63
100
48
August
84.1
84
87
85
86
September
90.0
88
80
100
97
October
94.1
92
94
93
90
November
89.9
96
92
88
93
December
0
0
0
0
Average
87.7
81.8
86.3
86.6
88.6
87.4
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.