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
71.4
81
65
81
78
75
February
80.4
73
77
91
83
85
March
84.7
80
92
87
89
85
April
93.4
91
98
95
92
May
95.1
94
91
98
96
June
97.4
96
100
94
99
July
98.0
100
97
96
100
August
98.5
100
100
98
98
September
93.4
88
96
84
97
October
88.2
93
88
72
94
November
75.7
90
79
70
80
December
63.1
76
41
63
44
Average
86.8
77.8
89.9
90.4
86.9
89.0
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.