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
75.9
71
81
94
69
64
February
90.9
89
94
91
92
83
March
93.9
92
92
92
99
95
April
95.8
99
98
93
92
May
97.6
99
99
97
95
June
98.0
99
100
97
99
July
99.8
100
100
100
100
August
99.6
100
100
100
99
September
98.1
97
96
97
97
October
94.2
93
96
94
93
November
85.0
73
80
91
86
December
70.7
58
71
80
76
Average
92.0
84.4
91.7
94.7
93.4
91.2
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.