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
71.7
82
81
66
57
67
February
80.5
77
81
74
85
83
March
82.9
88
84
81
72
88
April
94.1
97
90
94
92
May
96.0
99
95
95
98
June
97.6
98
97
98
97
July
95.4
94
96
93
96
August
94.2
90
96
94
93
September
94.9
98
92
96
97
October
90.1
87
91
91
91
November
78.1
67
84
77
85
December
75.0
70
65
75
80
Average
90.1
82.9
91.0
90.1
89.6
92.0
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.