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
51.2
65
65
38
80
33
February
53.3
40
36
62
69
58
March
77.7
85
87
76
69
92
April
84.7
89
81
98
80
88
May
93.1
88
97
100
96
June
90.6
95
100
97
79
July
88.3
92
97
96
74
August
89.4
94
95
89
82
September
81.5
88
92
79
80
October
63.1
69
63
65
70
November
60.3
81
39
73
50
December
69.0
73
74
76
59
Average
75.4
70.7
79.8
79.0
81.5
72.7
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.