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
65.3
70
67
60
58
63
February
79.9
70
88
75
81
85
March
89.9
89
89
94
96
91
April
94.7
94
88
97
99
May
95.2
95
99
93
98
June
95.6
100
97
91
94
July
96.0
96
100
88
98
August
95.5
91
100
92
98
September
93.6
98
90
95
94
October
83.5
93
80
85
80
November
67.7
75
68
46
77
December
58.7
56
62
43
62
Average
86.2
77.5
89.0
87.9
83.6
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.