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
78.2
84
71
90
73
78
February
89.2
83
95
99
80
99
March
94.3
95
99
95
88
96
April
96.2
92
95
97
100
May
97.5
99
99
97
97
June
98.1
98
97
99
98
July
99.0
99
99
96
100
August
97.4
97
95
96
97
September
96.7
99
97
97
98
October
92.9
96
93
95
97
November
76.0
93
63
78
70
December
85.5
85
62
91
78
Average
92.6
88.0
94.8
92.7
92.0
93.7
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.