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
76.1
82
100
100
98
0
February
67.2
80
100
100
57
0
March
68.5
99
96
99
46
0
April
71.7
99
100
85
0
May
74.0
98
97
97
0
June
72.4
97
92
95
0
July
93.5
94
94
98
88
August
97.5
99
98
93
100
September
77.6
97
99
79
100
October
70.8
97
99
56
100
November
79.2
100
97
100
98
December
78.6
100
100
100
100
Average
69.1
87.1
98.0
97.9
83.6
48.4
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.