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
71.1
76
66
80
72
73
February
71.1
57
81
90
65
80
March
73.7
58
68
88
83
75
April
89.1
83
81
92
98
94
May
88.4
95
93
84
95
June
88.9
93
95
77
95
July
92.5
93
93
94
89
August
90.8
84
92
96
88
September
84.3
79
88
83
84
October
76.6
84
71
72
77
November
61.6
57
49
78
65
December
65.4
70
95
73
34
Average
81.4
69.0
82.3
87.5
83.4
83.3
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.