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
76.6
86
96
68
85
63
February
69.0
61
65
75
80
65
March
76.4
71
95
57
70
85
April
94.2
100
84
95
99
94
May
97.4
99
99
98
93
June
98.6
99
99
100
99
July
98.4
99
100
98
99
August
98.6
99
99
99
98
September
97.6
96
100
99
94
October
94.8
78
99
100
92
November
97.7
91
100
95
100
December
80.5
88
100
66
93
Average
88.0
81.0
90.5
85.0
90.9
89.5
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.