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
60.0
66
82
48
48
77
February
73.6
78
84
66
77
71
March
85.2
96
82
80
90
96
April
91.9
92
84
91
96
May
97.0
98
97
93
98
June
97.7
97
97
97
98
July
96.7
97
95
100
99
August
99.0
99
100
100
99
September
95.1
98
85
96
100
October
86.5
81
82
95
93
November
65.0
61
62
68
70
December
49.5
59
66
51
66
Average
85.8
82.0
88.5
83.9
87.4
91.2
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.