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
88.8
95
99
78
94
88
February
87.2
86
82
96
91
91
March
81.1
77
94
70
78
93
April
86.2
92
85
82
97
May
81.5
85
68
92
90
June
77.8
85
73
78
79
July
74.8
72
93
71
84
August
88.2
74
96
91
97
September
94.2
89
95
98
96
October
93.2
90
91
93
100
November
93.4
94
94
93
89
December
91.7
90
99
88
96
Average
85.7
85.1
86.9
86.8
86.7
94.7
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.