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
81.8
95
83
94
80
70
February
88.1
93
96
98
83
99
March
95.7
95
96
100
97
98
April
97.0
98
94
98
99
May
96.9
94
97
98
98
June
98.4
99
98
100
97
July
98.8
98
99
100
99
August
98.6
99
99
99
98
September
94.8
97
89
98
96
October
89.1
91
85
88
90
November
71.9
91
71
67
58
December
73.9
81
43
73
47
Average
92.3
94.3
94.3
91.9
92.0
89.9
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.