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
73.6
81
87
70
72
73
February
84.0
81
74
92
76
95
March
89.5
92
86
90
93
93
April
94.8
94
97
94
99
May
95.8
94
97
97
99
June
95.1
97
99
92
93
July
95.2
95
98
96
94
August
96.2
95
99
93
97
September
92.3
96
94
93
93
October
89.8
86
92
94
92
November
76.9
82
79
79
80
December
68.4
61
72
55
67
Average
89.2
85.1
89.4
92.5
88.5
91.4
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.