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
84.9
83
78
80
95
80
February
84.9
81
91
89
92
84
March
83.6
91
87
77
85
80
April
87.5
92
91
95
76
May
87.0
90
76
85
90
June
91.6
89
91
91
96
July
90.6
79
93
86
95
August
89.3
92
93
97
82
September
76.8
75
85
74
79
October
77.5
88
81
59
81
November
78.5
98
82
79
68
December
82.0
90
74
86
67
Average
84.8
84.9
87.6
85.3
85.4
82.4
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.