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
66.9
76
69
64
67
63
February
83.6
70
85
90
86
93
March
90.5
91
96
89
94
90
April
93.9
87
90
97
95
May
93.4
93
97
95
99
June
93.7
97
95
90
97
July
96.4
94
98
93
99
August
95.0
93
99
96
97
September
92.6
93
94
89
94
October
86.7
89
89
89
86
November
74.2
78
70
71
82
December
66.9
75
59
61
61
Average
87.3
80.1
88.8
89.1
87.7
90.0
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.