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
90.1
83
94
95
80
97
February
90.7
94
87
90
87
91
March
95.5
99
99
94
88
99
April
97.3
100
98
94
94
100
May
91.8
98
74
88
98
June
79.0
84
87
82
79
July
66.7
66
60
71
77
August
70.5
89
72
73
68
September
78.6
78
84
77
63
October
77.9
76
86
71
78
November
79.3
87
66
78
81
December
84.2
88
77
85
76
Average
84.5
93.9
86.7
81.5
81.0
82.7
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.