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
81.0
75
100
94
83
100
February
80.9
78
100
96
67
0
March
95.9
96
100
100
67
100
April
93.6
93
100
100
100
May
94.3
96
89
33
June
92.0
92
100
100
July
96.5
97
100
100
August
87.2
89
50
78
September
85.8
91
100
77
0
October
91.1
94
100
87
November
84.4
90
100
71
100
December
81.2
82
88
77
100
Average
86.2
83.7
91.5
93.6
78.1
95.4
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.