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
69.3
79
77
57
73
74
February
84.4
75
88
87
89
92
March
91.9
94
92
94
95
91
April
95.2
92
92
98
95
May
94.1
94
97
92
95
June
94.8
97
94
96
94
July
96.4
97
100
92
99
August
95.3
93
99
95
94
September
94.2
96
94
94
96
October
86.0
94
89
87
86
November
76.3
82
76
79
86
December
68.2
73
74
65
67
Average
88.3
83.7
90.7
89.9
89.4
90.3
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.