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
49.8
56
22
59
48
41
February
70.7
65
65
71
78
83
March
87.2
83
96
77
82
88
April
92.7
91
94
96
92
May
96.4
94
89
100
98
June
97.7
90
100
100
100
July
96.0
91
92
95
99
August
98.6
99
99
100
100
September
94.9
89
96
93
100
October
91.6
88
95
91
94
November
61.3
82
72
41
45
December
44.5
44
10
56
31
Average
82.3
68.8
81.5
83.3
83.8
83.6
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.