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
81.2
90
89
75
82
78
February
83.6
70
86
80
95
87
March
88.6
92
95
92
94
87
April
92.1
87
95
100
91
May
89.8
89
93
96
93
June
87.3
85
97
79
91
July
89.8
88
96
82
84
August
89.6
87
87
91
91
September
91.9
95
93
92
95
October
87.5
92
88
90
90
November
89.2
87
91
94
89
December
80.8
86
85
71
89
Average
87.8
84.6
88.6
90.4
89.1
89.1
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.