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
78.5
86
80
93
75
78
February
80.3
89
92
97
70
97
March
91.0
92
94
90
92
98
April
92.1
84
92
94
100
May
93.6
93
98
95
95
June
95.1
97
95
98
85
July
97.1
99
98
97
95
August
93.5
91
88
95
92
September
91.0
97
94
91
91
October
88.6
94
86
95
85
November
79.8
92
70
81
77
December
76.6
73
47
66
74
Average
89.4
89.2
91.4
90.1
89.5
90.0
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.