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
97.0
98
100
97
100
96
February
94.4
95
92
98
95
94
March
97.3
99
99
96
98
96
April
97.4
100
94
97
99
May
89.4
98
89
89
81
June
66.0
72
66
70
71
July
58.1
59
50
66
69
August
78.1
70
81
75
85
September
94.0
95
99
90
93
October
93.4
90
97
95
93
November
95.0
85
96
95
95
December
95.2
94
96
97
97
Average
88.1
97.4
86.8
87.5
87.2
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.