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
78.7
99
91
60
73
70
February
82.5
97
96
76
72
74
March
88.4
100
96
82
85
80
April
85.2
96
94
76
87
72
May
92.9
97
89
87
98
June
94.4
95
95
92
96
July
91.9
100
94
89
87
August
93.8
100
99
85
95
September
91.7
94
98
87
90
October
89.5
93
91
84
91
November
90.6
93
89
86
97
December
79.9
86
83
79
69
Average
89.3
97.8
94.9
86.3
84.0
85.2
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.