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
70.7
82
95
67
66
67
February
81.8
78
91
86
82
77
March
88.1
87
93
92
90
83
April
84.3
89
82
92
87
May
82.1
97
92
90
86
June
79.3
87
91
73
89
July
88.7
96
97
55
95
August
87.5
94
75
87
98
September
91.7
95
96
90
86
October
82.3
93
88
91
86
November
78.4
84
88
73
83
December
67.4
77
75
73
57
Average
82.7
82.7
91.4
87.0
80.3
84.6
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.