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
88.1
88
82
81
92
86
February
87.5
86
90
84
88
74
March
89.7
83
91
94
88
91
April
89.5
85
87
95
90
May
87.9
87
89
86
90
June
87.4
87
84
86
87
July
89.3
91
90
86
89
August
86.0
87
90
91
87
September
85.0
90
76
87
77
October
84.6
83
91
72
85
November
87.5
91
85
84
93
December
89.4
91
84
90
87
Average
87.5
85.5
87.8
86.2
86.8
86.0
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.