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
66.4
43
65
78
55
88
February
82.7
76
78
81
85
90
March
86.5
77
85
89
95
96
April
91.5
85
91
92
91
100
May
95.2
92
99
98
99
June
98.5
99
98
99
100
July
98.5
99
95
100
100
August
97.7
98
98
98
99
September
96.4
97
97
99
99
October
77.3
59
87
70
90
November
56.8
62
39
62
63
December
48.1
42
46
51
44
Average
82.2
70.3
80.4
84.4
84.1
89.0
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.