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
95.8
96
92
92
0
99
February
94.2
97
96
93
100
95
March
90.5
95
90
89
0
88
April
84.3
82
83
0
84
May
76.8
77
81
0
5
June
79.8
80
74
0
50
July
77.9
83
84
0
43
August
83.6
89
74
67
0
September
90.1
92
85
0
0
October
93.5
94
92
0
0
November
94.3
93
92
50
100
December
94.8
93
97
100
0
Average
84.6
95.8
89.1
86.6
50.0
88.7
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.