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
81.5
89
79
77
85
85
February
87.1
86
93
89
88
84
March
88.8
84
90
92
89
April
92.0
88
96
90
92
May
94.3
99
96
95
96
June
95.3
100
88
97
95
July
95.9
97
96
90
99
August
88.5
88
93
89
81
September
89.5
92
97
86
91
October
77.1
84
78
79
72
November
69.5
68
64
72
58
December
78.9
74
80
82
70
Average
88.5
87.5
89.8
89.5
88.7
87.2
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.