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
74.8
77
84
78
76
57
February
76.0
87
81
90
81
56
March
79.6
87
79
81
67
91
April
91.2
96
93
95
99
May
93.9
93
98
95
90
June
90.6
97
91
80
93
July
87.6
88
93
88
86
August
91.0
94
94
91
81
September
89.1
88
98
84
87
October
78.9
78
89
80
76
November
76.7
84
65
73
83
December
82.7
77
97
86
86
Average
84.5
83.5
87.0
89.1
83.3
82.5
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.