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
91.8
87
90
88
93
87
February
92.8
97
85
92
95
93
March
94.9
94
95
98
95
92
April
95.4
84
99
95
98
May
89.8
96
91
92
June
83.6
78
76
91
80
July
81.2
74
75
67
89
August
85.8
89
81
73
89
September
88.3
93
87
75
95
October
85.1
90
88
79
88
November
85.0
81
74
85
73
December
88.6
85
86
80
96
Average
89.1
92.8
86.5
86.0
84.7
89.2
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.