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
80.1
86
88
73
74
67
February
85.3
81
77
92
86
86
March
87.0
81
86
89
88
89
April
88.9
86
93
92
89
May
89.5
82
92
94
99
June
90.6
94
95
85
93
July
94.3
93
97
93
90
August
93.4
91
92
97
91
September
91.9
89
93
92
91
October
90.8
90
93
92
94
November
80.3
82
74
86
79
December
77.7
74
85
69
85
Average
87.9
82.1
86.6
90.0
88.8
88.8
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.