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
89.4
83
100
96
97
56
February
72.7
79
56
81
80
85
March
81.2
76
86
81
80
94
April
97.9
100
100
90
97
May
94.4
97
89
89
96
June
96.8
100
98
94
89
July
97.8
97
100
99
94
August
98.0
99
99
98
98
September
98.1
100
99
96
97
October
96.4
93
99
98
98
November
93.7
85
96
100
100
December
89.3
69
100
100
99
Average
91.8
79.2
90.5
96.0
93.3
91.8
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.