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
62.9
90
83
65
47
February
81.8
91
95
68
90
March
90.6
97
95
84
86
April
96.6
95
94
99
May
95.0
99
95
92
June
96.8
99
99
91
July
96.4
98
98
90
August
97.6
98
96
99
September
94.1
86
96
92
October
83.4
73
90
71
November
60.6
58
62
40
December
59.2
39
63
67
54
Average
82.0
93.0
38.4
90.4
87.6
82.5
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.