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
75.3
77
78
93
84
52
February
84.5
95
89
95
81
98
March
95.0
100
91
99
96
94
April
95.5
96
95
92
100
May
96.3
90
97
99
100
June
98.1
97
99
99
99
July
98.6
97
100
100
97
August
98.1
97
97
97
99
September
96.7
94
97
95
100
October
90.9
98
83
88
86
November
74.8
91
60
72
52
December
74.7
80
76
72
60
Average
91.4
91.5
92.2
92.5
91.1
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.